Emoji, symbols & handy little tools

1155 small tools that run entirely in your browser. Nothing to install, nothing to sign up for, and nothing you type ever leaves your device.

What Pikkit is

Pikkit is a hand-built collection of 1155 small tools, each doing one job well: pick an emoji, convert a file, check a sum, sign a PDF, tidy a recording. Every one runs entirely inside your browser — the page IS the program — so there is nothing to install, no account to create, and nothing you enter is ever uploaded. Load a tool, go offline, and it keeps working.

Each tool page explains what the tool does, how it works and, just as deliberately, what it can't do: the PDF compressor says its method turns text into images, the audio speed changer says pitch moves with speed, the sharpener says it can't recover detail a photo never captured. Tools that compute something are checked against independently worked-out values before they go live. The guides go deeper into the ideas behind the tools — why Easter moves, how QR codes survive damage, what a one-rep max measures — and the about page covers who makes all this and how it's funded.

Emoji & Symbols

6 toolsView all →

Browse, search and copy every emoji, symbol and text face.

Emoji ListEvery emoji, searchable by name, with skin tones and one-click copy.SymbolsArrows, maths, currency, stars, brackets, Greek and more.Text FacesJapanese kaomoji for every mood, ready to copy.Lenny FaceBuild your own Lenny from eyes, mouth and arms, or grab a preset.Emoji to ImageTurn any emoji into a PNG you can download and use as an icon.Text ArtBorders, dividers, blocks and box-drawing characters.

Text Tools

94 toolsView all →

Restyle, count, clean, compare and mangle text.

Calculators

509 toolsView all →

Everyday sums, money, dates and timers.

Money

Percentage CalculatorWhat is X% of Y, X is what % of Y, and percentage change.Tip CalculatorWork out the tip and split the bill between any number of people.Discount CalculatorWhat you pay after a discount, and what you actually saved.VAT & Sales TaxAdd or remove VAT, GST or sales tax at any rate.Loan CalculatorMonthly repayments, total interest and a full amortisation schedule.Compound InterestWatch savings grow with monthly deposits and compound interest.Savings GoalHow long to reach a target — or how much per month — interest included.Rent Split CalculatorFair rent shares — equal, by income, or by room size, honestly argued.Fuel Cost CalculatorThe cost of a trip from distance, consumption and fuel price.Electricity CostWhat an appliance costs to run per day, month and year.Invoice GeneratorRemembers your details, logo and clients. Print a clean PDF.Time TrackerClock in and out on projects and see your hours add up by day and week.Salary ConverterHourly to yearly to monthly — type any figure and the rest follow.Margin CalculatorCost, price, margin and markup — any two in, the confusion settled.Overtime PayTime-and-a-half and double time, itemised into a gross weekly total.Unit Price CalculatorCompare products by price per 100 g, 100 ml or item — find the best value.Mortgage CalculatorMonthly payment, total interest, amortisation schedule and overpayment savings.Expense SplitterWho paid what on the trip — and the fewest transfers to settle up.Quotation GeneratorLine-item quotes with tax, validity and notes — print or save as PDF.Expense Report GeneratorItemised expense claims by category with receipt ticks and CSV export.Mileage LogLog business trips, apply a per-mile rate and export the claim as CSV.Budget PlannerMonthly budget by needs, wants and savings with the 50/30/20 check.Subscription TrackerEvery recurring bill in one list, with the true monthly and yearly cost.Credit Card Payoff CalculatorMonths and interest to clear a balance at a fixed or minimum payment.Net Worth CalculatorAssets minus liabilities with saved snapshots to track the trend.Debt Snowball CalculatorSnowball vs avalanche payoff plans: months, interest and debt-free date for every debt.Retirement CalculatorProject your pension pot to retirement age in today's money, plus the income it gives.Inflation CalculatorWhat an amount is worth between two years at a rate you set — purchasing power lost.Receipt GeneratorA till-style receipt for a payment received: items, tax and a PAID stamp. Print or PDF.Purchase Order GeneratorPO with number, supplier, ship-to, SKU lines, delivery date and terms. Print or PDF.ROI CalculatorReturn on investment and annualised ROI, comparing up to three investments.CAGR CalculatorCompound annual growth rate between two values, plus end value and years needed.NPV & IRR CalculatorNet present value, IRR, payback and profitability index from your cash flows.Timesheet CalculatorWeekly hours from start and end times with breaks, overtime rules and gross pay.Payslip GeneratorA printable pay statement with earnings, deductions, net pay and year-to-date.Rent vs Buy CalculatorYear-by-year net cost of owning versus renting, and the year buying pulls ahead.SIP CalculatorMonthly investment growth with step-up: invested, gains and maturity value.Stock Average CalculatorAverage cost per share across buys, profit or loss, and shares to reach a target.FD CalculatorFixed deposit maturity value with any compounding, tenure and yearly table.RD CalculatorRecurring deposit maturity from a monthly instalment, rate and tenure.Simple Interest CalculatorI = P × R × T — solve for interest, principal, rate or time, in days or years.APR CalculatorThe true annual rate of a loan once fees are included, plus effective annual rate.Home Affordability CalculatorHow much house you can afford from income, debts and deposit, by the 28/36 rule.Debt-to-Income CalculatorFront-end and back-end DTI ratios with the thresholds lenders use.Emergency Fund CalculatorHow big your emergency fund should be, the gap, and months to build it.FIRE CalculatorYour financial independence number, years to reach it, and Coast FIRE.Loan Comparison CalculatorCompare three loan offers: payment, interest, fees, total cost and APR.Dividend CalculatorDividend yield, monthly income and a DRIP reinvestment projection with growth.Crypto Profit CalculatorProfit, ROI and break-even price on a crypto trade after buy and sell fees.Car Lease vs Buy CalculatorNet cost of leasing a car against buying it with a loan, resale value included.Smoking Cost CalculatorWhat smoking or vaping costs a year and a decade, and savings since quitting.Pay Raise CalculatorNew salary from a raise, the percentage, per-period pay and real raise.Packing Slip GeneratorPrintable packing slips with ordered, shipped and back-ordered quantities.Rule of 72 CalculatorHow long money takes to double at a rate, or the rate to double in a set time.TVM CalculatorFinancial calculator: solve N, I/Y, PV, PMT or FV for loans and savings.Annuity CalculatorMonthly income a pot can pay for a set time, or the pot needed for an income.IRR CalculatorInternal rate of return, NPV, MIRR and profitability index for cash flows.Payback Period CalculatorSimple and discounted payback for even or uneven yearly cash flows.Bond Yield CalculatorYield to maturity and current yield from price, or price from a yield.Rental Property CalculatorCash flow, cap rate, cash-on-cash return and DSCR for a buy-to-let.Mortgage Points CalculatorAre discount points worth it? Cost, monthly saving and break-even month.Refinance CalculatorNew payment, monthly saving and break-even on closing costs when refinancing.Dollar-Cost Averaging CalculatorUnits bought, average cost and lump-sum comparison for regular investing.50/30/20 Budget CalculatorSplit take-home pay into needs, wants and savings, and compare with real spending.EV Charging Cost CalculatorCost, time and range of charging an electric car at home or a public charger.EV vs Petrol Cost CalculatorYearly running cost of an electric car vs petrol or diesel, payback and CO2.College Savings CalculatorProjected university cost and the monthly saving needed to reach it.Wedding Budget CalculatorSplit a wedding budget by category, cost per guest and track spending.Cash CounterCount notes and coins for a till or cash box, with float and over/short.Car Loan CalculatorMonthly payment, amount financed and interest with deposit, trade-in, tax and fees.Student Loan CalculatorUK income-contingent repayments and write-off, or a standard US-style loan.UK Income Tax CalculatorTake-home pay after income tax, National Insurance, pension and student loan.Stamp Duty CalculatorSDLT, Scottish LBTT and Welsh LTT with first-time buyer and second-home rates.Investment Fee CalculatorHow much fund and platform fees cost you over time, comparing two fee levels.Loan-to-Value CalculatorMortgage LTV %, your lender band and the deposit needed for each band.Late Payment Interest CalculatorUK statutory interest (8% + base rate) and compensation on overdue invoices.Rent Affordability CalculatorHow much rent you can afford: 30% rule, 40× landlord test and your budget.Cost Per Use CalculatorCompare purchases by the real cost of each use, including upkeep and resale.Sales Tax CalculatorAdd sales tax, remove it from a total, or find the rate — state plus local.Capital Gains Tax Calculator (UK)UK CGT on shares, crypto or property: £3,000 allowance, 18% and 24% rates.Inheritance Tax Calculator (UK)UK IHT on an estate: nil-rate bands, spouse transfers, charity 36% rate.Dividend Tax Calculator (UK)Tax on UK dividends on top of salary: £500 allowance, 8.75% to 39.35%.Self-Employed Tax Calculator (UK)Sole trader income tax and Class 4 NI from profit, with take-home pay.Marriage Allowance CalculatorCheck if you qualify for UK marriage allowance and how much you'd save.Offset Mortgage CalculatorInterest and years saved by offsetting savings against your mortgage.Pension Tax Relief CalculatorWhat a UK pension contribution really costs after tax relief and NI.State Pension Age CalculatorYour UK State Pension age and the exact date you reach it.Rent Increase CalculatorNew rent, percentage rise, yearly cost and start date after notice.Price per Square Foot CalculatorCompare properties by price per square foot and per square metre.Paycheck Calculator (US)US take-home pay per paycheck after federal, FICA, state tax and 401(k).401(k) CalculatorProject your 401(k) with employer match, raises, returns and IRS limits.Roth IRA CalculatorYour 2026 Roth IRA limit after the income phase-out, and tax-free growth.HSA Calculator2026 HSA limits, the tax you save and what an invested HSA could grow to.Balance Transfer CalculatorDoes a 0% balance transfer save money after the fee? Compare and see.APY CalculatorConvert APR to APY (AER) for any compounding, and see interest earned.Closing Cost CalculatorEstimate US home closing costs and the cash you need to close.Stock Profit CalculatorProfit, return, annualised return and break-even price on a stock trade.Options Profit CalculatorPayoff at expiry for calls and puts: break-even, max profit and loss.Sinking Fund CalculatorHow much to save each month for planned costs by their due dates.Car Depreciation CalculatorWhat a car will be worth year by year, and what depreciation costs per mile.Travel Budget CalculatorPlan trip costs per person and per day, with a contingency.

Business & marketing

Break-Even CalculatorUnits and revenue to cover fixed costs, with a chart and target profit.Ad Cost CalculatorCPM, CPC, CTR, CPA, ROAS and break-even ROAS from your campaign figures.A/B Test CalculatorIs the lift real? p-value, confidence interval and the sample size you need.Decision MatrixWeighted scoring of options against criteria, with a sensitivity check.Freelance Rate CalculatorThe hourly and day rate you need from income, costs, time off and billable share.Commission CalculatorFlat, tiered marginal or retroactive commission, with splits and base pay.Product Pricing CalculatorSolve the selling price for a target margin after materials, labour and marketplace fees.SaaS Metrics CalculatorMRR, ARR, churn, net revenue retention, LTV, CAC and payback from one month.Startup Runway CalculatorMonths of cash left, the zero-cash month and break-even with growth rates.Meeting Cost CalculatorWhat a meeting costs in salaries, with a live ticker and the yearly cost if recurring.Cash Flow ForecastTwelve months of money in and out with recurring lines, a chart and the low point.NPS CalculatorNet Promoter Score from counts or raw survey scores, with margin of error.Sample Size CalculatorSurvey responses needed for a confidence level and margin of error, and the reverse.Depreciation CalculatorStraight-line, declining balance, SYD and units-of-production schedules.Payment Terms CalculatorNet 30 / EOM due dates, 2/10 net 30 discount value and late interest.Reorder Point CalculatorWhen to reorder stock: lead-time demand plus safety stock from a service level.EOQ CalculatorEconomic order quantity, orders per year and total ordering + holding cost.Conversion Funnel CalculatorStep conversion rates, drop-off and traffic needed to hit a sales target.Inventory Turnover CalculatorInventory turnover ratio, days inventory outstanding and sell-through rate.SMART Goal GeneratorTurn a rough goal into a SMART goal statement with milestones and checks.SWOT AnalysisA printable SWOT grid with TOWS strategy prompts, saved as you type.RACI MatrixWho's responsible, accountable, consulted and informed — with checks and CSV.Business Model CanvasThe nine-block business model canvas online, printable and saved as you type.Buyer Persona GeneratorA one-page buyer persona: goals, pains, objections, channels and key message.Content CalendarPlan posts by date, channel and status in a month grid, then export CSV.Eisenhower MatrixSort tasks into Do, Schedule, Delegate and Delete by urgency and importance.Employee Cost CalculatorTrue yearly cost of an employee beyond salary, and cost per productive hour.Tip Pool CalculatorShare pooled tips by hours, role points or equally, with cash rounding.OKR GeneratorWrite Objectives and Key Results with quality checks and 0–1 scoring.PTO Accrual CalculatorPaid time off accrued per pay period or hours worked, and UK holiday pay.Notice Period CalculatorYour last day from the notice date and length, plus UK statutory notice.Equity Dilution CalculatorHow a funding round and option pool dilute founders and shareholders.Startup Valuation CalculatorRevenue multiple, VC method and Scorecard valuations side by side.COGS CalculatorCost of goods sold, gross margin, inventory turnover and unit costs.PERT Estimate CalculatorThree-point task estimates with project totals and confidence levels.RICE Score CalculatorPrioritise features by Reach, Impact, Confidence and Effort.Job Offer Comparison CalculatorCompare offers on total pay, benefits, costs, living costs and hours.Employee Turnover CalculatorTurnover and retention rates, voluntary vs involuntary, and the cost.Bradford Factor CalculatorAbsence score S² × D from spells and days or a list of dates.FTE CalculatorFull-time equivalent, pro-rata salary and holiday for part-time staff.Utilization Rate CalculatorBillable vs available hours for a person or team, against a target.Job Application TrackerTrack applications by stage with follow-up dates, response rate and CSV export.

Dates, age & pets

Age CalculatorYour exact age in years, months, days — plus the next birthday.Date CalculatorDays between two dates, or add and subtract days from one.Days SinceLive day counts since any date — anniversaries, streaks, milestones.Day of the WeekWhat day any date falls on — including the day you were born.CalendarBrowse any month and year, with week numbers — and print it.Working Days CalculatorBusiness days between dates, or a deadline N working days from now.Week NumberWhat week is it? Today's ISO week number and every week of the year.Leap Year CheckerIs any year a leap year? The full rule, explained, with the next five.Easter CalculatorThe exact date of Easter for any year — plus Lent, Pentecost and Pancake Day.Moon PhaseTonight's moon phase, any date's, and the next full and new moons.Sunrise & SunsetSun times for any place and date — NOAA math, computed on your device.Zodiac Sign FinderYour star sign from your birth date — plus your Chinese zodiac animal.Christmas CountdownDays, hours and sleeps until Christmas — live, in your time zone.New Year CountdownLive countdown to midnight, January 1 — plus how much of the year is left.Dog Age CalculatorYour dog's age in human years, adjusted for size.Cat Age CalculatorYour cat's age in human years, on the chart vets use.Age Difference CalculatorExact age gap between two birth dates in years, months, days and total days.Life in WeeksYour life as a grid of weeks, with weeks lived and left and upcoming milestones.Baby Age CalculatorBaby's age in months, weeks and days, corrected age for preemies, and milestones.Pet Calorie CalculatorDaily calories and food portions for a dog or cat by weight and life stage.Generation CalculatorWhich generation you belong to by birth year, from Boomers to Gen Beta.Calendar ConverterA date in the Hebrew, Islamic, Persian, Chinese, Julian and other calendars.Julian Date ConverterDate ↔ day of year (YYDDD) for food codes, plus astronomical JD and MJD.Dog Chocolate Toxicity CalculatorTheobromine dose in mg/kg from chocolate type, amount and dog weight.Half Birthday CalculatorFind your half birthday, how many days until it and your 'and a half' age.School Year CalculatorWhich school year or grade a child is in from their birthday, UK and US.Wedding Anniversary CalculatorYears married, next anniversary, gift by year and day milestones.

Clocks & time zones

World ClockThe current time in cities around the world, all at once.Time Zone ConverterCompare a time across cities and find a slot that works for everyone.Digital ClockA big, clear clock for a second screen — full screen, any time zone.Analog ClockA classic clock face with sweeping hands, in any time zone.Binary ClockThe classic BCD clock — read the time from lights, learn binary free.Alarm ClockSet an alarm for any time of day and it rings, even in a background tab.Meeting PlannerFind an hour inside everyone's working day across up to eight time zones.Military Time ConverterConvert 12-hour and 24-hour time, how to say it, and a full chart.Jet Lag CalculatorTime zones crossed, adjustment time and a light and sleep plan.

Timers

Timer & StopwatchA countdown timer with an alarm, and a stopwatch with laps.StopwatchA big, precise stopwatch with lap times — space bar to start.Countdown to a DateA live countdown to any date — days, hours, minutes and seconds.Pomodoro TimerWork for 25, break for 5 — with automatic cycles and a session count.Interval TimerA HIIT and Tabata timer — work, rest, rounds, big colours and beeps.Egg TimerSoft, medium or hard — pick your yolk, get a countdown and alarm.Time CalculatorAdd and subtract hours, minutes, seconds — plus decimal hours.Meeting TimerAgenda items with minutes, a big countdown, round-robin speakers, overrun tally.Contraction TimerTime labour contractions: length, frequency and a 5-1-1 check.Breathing ExerciseGuided breathing: box breathing, 4-7-8 and resonant breathing with an animation.Meditation TimerA quiet meditation timer with singing-bowl bells and interval chimes.

School & science

Scientific CalculatorTrig, logs, powers and parentheses, with a visible history.GPA CalculatorWork out your GPA from letter grades and credit hours.Final Grade CalculatorWhat do you need on the final to hit your target grade?Times TablesThe multiplication grid, plus a practice quiz that keeps score.FlashcardsMake flashcard decks and quiz yourself — flip, shuffle and track what you know.Sig Figs CalculatorCount significant figures with the rule that applied, and round to any.Scientific NotationDecimal to a × 10ⁿ and back — with e-notation and engineering form.Periodic TableAll 118 elements by category, with search and atomic weights.Molar Mass CalculatorMolar mass and mass percent from a chemical formula, with grams ↔ moles.Matrix CalculatorDeterminant, inverse, rank, multiply and solve Ax = b, in exact fractions.Permutation & Combination CalculatornPr and nCr with and without repetition, exact for any size, with listings.Graphing CalculatorPlot up to four functions of x with pan, zoom and trace — no sign-up.Attendance CalculatorAttendance %, classes to attend to reach 75%, and how many you can miss.Half-Life CalculatorExponential decay: amount left, time, half-life or start, with isotopes.Dilution CalculatorC1V1 = C2V2 for any unknown, with units, mixing amounts and serial dilutions.pH CalculatorpH, pOH, [H⁺] and [OH⁻]; strong and weak acids and bases; buffers.SUVAT CalculatorConstant-acceleration motion: give any three of s, u, v, a, t, get the rest.Percent Error CalculatorPercent error, signed and absolute error, and percent difference, with working.Density CalculatorSolve density, mass or volume with units, and compare with common materials.Molarity CalculatorMass to weigh, molarity or volume for a solution, with compound presets.Ideal Gas Law CalculatorSolve PV = nRT for pressure, volume, moles or temperature in any units.Projectile Motion CalculatorRange, max height, flight time and impact speed with a trajectory plot.Wavelength & Frequency CalculatorConvert wavelength and frequency for light or sound, with photon energy.Weight on Other PlanetsYour weight and jump height on the Moon, Mars, Jupiter and beyond.Energy CalculatorKinetic and potential energy, power, and joules to kWh, kcal and BTU.Long Division CalculatorLong division with every step shown, remainder and repeating decimals.Maths Worksheet GeneratorPrintable arithmetic worksheets with answer keys for any number range.Chemical Equation BalancerBalance any chemical equation exactly, with brackets, hydrates and charges.Empirical Formula CalculatorEmpirical and molecular formula from percent composition or masses.Punnett Square CalculatorMono-, di- and trihybrid crosses with genotype and phenotype ratios.Blood Type CalculatorPossible child blood types (ABO and Rh) from the parents' blood types.DNA TranslatorComplement, reverse complement, mRNA and protein in three reading frames.Unit CircleInteractive unit circle with sin, cos, tan and exact values for every angle.Greek AlphabetAll 24 Greek letters with names, pronunciation and uses — click to copy.Test Grade CalculatorTest score percentage and letter grade, plus a printable grading chart.Rubric MakerBuild, score and print a grading rubric with criteria and levels.Simultaneous Equations SolverSolve 2–4 linear equations exactly, with fractions, checks and steps.Age on Other PlanetsYour age in Mercury, Mars, Jupiter and other planet years, and next birthdays.Air Density CalculatorAir density from temperature, pressure or altitude and humidity.Beaufort Scale ConverterWind speed to Beaufort force 0–12 with land and sea effects.Lightning Distance CalculatorHow far away lightning struck, from flash-to-thunder seconds.Earthquake Magnitude CalculatorCompare earthquake magnitudes: shaking, energy and TNT equivalent.Speed of Sound CalculatorSpeed of sound at any temperature, in water and solids, with wavelength.Free Fall CalculatorFall time and impact speed, with or without air resistance.Momentum CalculatorMomentum, impulse and elastic or inelastic collisions.Force CalculatorF = ma in any units, plus the resultant of several forces.Hooke's Law CalculatorSpring force, constant, energy, period and springs combined.Gravitational Force CalculatorNewton's law of gravitation between any two masses.Pendulum CalculatorPendulum period, frequency and length, with large-swing correction.Centripetal Force CalculatorCentripetal force, acceleration, g-force and banking angle.Buoyancy CalculatorBuoyant force, float or sink, and how much is submerged.Inclined Plane CalculatorForces on a slope with friction: sliding, acceleration, effort.Escape Velocity CalculatorEscape and orbital speed for any planet, moon or star.Orbital Period CalculatorOrbit period and speed from altitude (Kepler's third law).Light-Year ConverterConvert light-years, parsecs, AU, km and miles, with travel times.Time Dilation CalculatorRelativistic time dilation for speed and gravity, with GPS.Doppler Effect CalculatorDoppler shift for sound and light, with redshift z.Lens Equation CalculatorThin lens and mirror equation: image distance and magnification.Snell's Law CalculatorRefraction angle, critical angle and Brewster's angle.Specific Heat CalculatorQ = mcΔT: heat energy, mass, specific heat or temperature change.Percent Yield CalculatorPercent yield and theoretical yield from the limiting reactant.Thermal Expansion CalculatorLinear and volume thermal expansion of solids and liquids.Sun Angle CalculatorSun elevation, azimuth and shadow length for any place and time.Boiling Point at AltitudeThe temperature water boils at for any altitude or air pressure.Handwriting Worksheet GeneratorPrintable tracing sheets for letters, words and sentences.Report Card Comment GeneratorDraft personalised report card comments from strengths and next steps.Lesson Plan GeneratorFill in and print a structured lesson plan with a timing check.Spelling Test MakerPrintable spelling tests, practice grids and word puzzles.Number Line GeneratorPrintable number lines with decimals, negatives or fractions.Clock Worksheet GeneratorPrintable telling-time worksheets with an answer key.Study PlannerRevision timetable from your exams, hours and subjects.

Maths & geometry

Fraction CalculatorAdd, subtract, multiply and divide fractions, with the steps shown.Ratio CalculatorSolve a:b = c:d for the missing value, and simplify any ratio.Average CalculatorMean, median, mode, range and sum from any list of numbers.Standard DeviationSample or population standard deviation with every step shown.Quadratic SolverRoots, discriminant and vertex for ax² + bx + c — complex roots included.Prime NumbersCheck if a number is prime, factorise it, and list primes to 100,000.GCD & LCMGreatest common divisor and least common multiple, with Euclid's steps.Area CalculatorRectangle, circle, triangle, trapezoid and ellipse — area and perimeter.Volume CalculatorBox, sphere, cylinder, cone and pyramid volumes — litres included.Slope CalculatorTwo points in — slope, line equation, intercepts, distance, midpoint out.Pythagorean TheoremSolve any side of a right triangle, drawn to scale, working shown.Speed Distance TimeEnter any two, get the third — km/h, mph, m/s and knots handled.Triangle SolverSolve any triangle from three values: sides, angles, area, heights and type.Logarithm CalculatorLog to any base, natural log, antilog and solving for the base, with rules.Z-Score CalculatorZ-scores, percentiles and p-values, and z from a percentile, with a bell curve.Linear Regression CalculatorLine of best fit from x, y data: slope, intercept, r, R² and a scatter plot.Confidence Interval CalculatorConfidence intervals for a mean (t or z) or a proportion (Wilson).Truth Table GeneratorTruth tables for Boolean expressions, with tautology check and canonical forms.Probability CalculatorTwo-event probabilities (and, or, not, given) and repeated-trial odds.Chi-Square CalculatorGoodness-of-fit and independence tests with p-value and Cramér's V.T-Test CalculatorOne-sample, two-sample (Welch or pooled) and paired t-tests from raw data.Complex Number CalculatorAdd, multiply, divide and raise complex numbers, with polar form.Vector CalculatorDot and cross products, magnitude, angle and projection for 2D/3D vectors.Exponent CalculatorPowers of any base, exact big powers, and solve for the exponent or base.Number Sequence CalculatorFind the pattern, formula, next terms, nth term and sum of a sequence.Big Number CalculatorExact arithmetic, powers and factorials for integers of any size.Percentile CalculatorAny percentile of a data set, plus the percentile rank of a value (Excel methods).Box Plot MakerBox-and-whisker plots with quartiles, IQR and outliers; compare sets, download SVG/PNG.Histogram MakerTurn a list of numbers into a histogram with automatic or custom bins; download it.Weighted Average CalculatorWeighted mean of scores, grades or prices, and the score you need to hit a target.Decimal to Fraction CalculatorExact fractions for decimals and repeating decimals, plus the closest simple fraction.Rounding CalculatorRound to decimal places, significant figures or a multiple, with every rounding rule.Binary CalculatorAdd, subtract, multiply, divide and AND/OR/XOR/NOT in binary, octal, decimal or hex.IEEE-754 Float ConverterSee how a number is stored as a 32- or 64-bit float: sign, exponent, mantissa, error.Golden Ratio CalculatorSplit a length into golden sections or find the matching side, with a golden scale.Cubic Equation SolverAll three roots of ax³ + bx² + cx + d = 0, real and complex, with a graph.Karnaugh Map SolverSolve K-maps for 2–6 variables: exact minimal SOP and POS.Poisson Distribution CalculatorPoisson probabilities: exactly, at most or at least k events.Expected Value CalculatorExpected value, variance and SD of outcomes and probabilities.Factorial CalculatorExact n! to 20,000, digits, trailing zeros and gamma function.Modulo Calculatora mod n (all conventions), modular power and modular inverse.Surface Area CalculatorSurface area and volume of cylinders, cones, spheres and more.Polygon CalculatorRegular polygon area, side, apothem, radius and angles.Circle CalculatorRadius, diameter, circumference, area, arc, sector and chord.Angle ConverterDegrees, radians, gradians, DMS, turns and mils, with trig values.Summation CalculatorEvaluate sigma sums and pi products of any expression.Integral CalculatorDefinite integrals of any function, to 10+ digits, with a plot.Derivative CalculatorSymbolic first and second derivatives, slope and tangent line.Polynomial Root FinderAll real and complex roots of a polynomial up to degree 12.Pascal's Triangle GeneratorExact Pascal's triangle rows, C(n, k) lookup and Sierpiński pattern.Collatz Sequence Calculator3n + 1 sequence steps, peak value and hailstone chart.Magic Square GeneratorVerified magic squares of any order from 3 to 30.Linear Interpolation CalculatorInterpolate between two points or within a data table.Divisors CalculatorAll divisors of a number, their sum and factor pairs.Geometric Mean CalculatorGeometric, harmonic and RMS means, and average growth rate.Square Root CalculatorSquare, cube and nth roots with simplest radical form.

Everyday converters

Unit ConverterLength, weight, temperature, volume, area, speed and data size.Temperature ConverterCelsius, Fahrenheit and Kelvin, live both ways — with the landmarks chart.Height ConverterCentimetres to feet & inches and back, with the 150–210 cm chart.Weight ConverterKilograms, pounds, and stone — type in any box, read the others.Cooking ConverterCups to grams and back — with real densities for flour, sugar, butter.Shoe Size ConverterUS, UK, EU and cm shoe sizes side by side, for men's and women's fits.Ring Size ConverterUS, UK, EU sizes and millimetres — plus how to measure at home.Fuel Economy ConverterMPG (US & UK), L/100km and km/L — plus your real consumption from a trip.Recipe ScalerPaste ingredients, change servings, get quantities rescaled with real fractions.Paint CalculatorLitres or gallons and tins for a room from its size, openings and coats.Tile CalculatorTiles, boxes, grout and adhesive for a floor or wall, with waste allowance.Concrete CalculatorConcrete volume for slabs, footings, posts and steps, with bags of premix needed.BTU CalculatorAir-conditioner size for a room in BTU, tons and kW, using ENERGY STAR sizing.Wallpaper CalculatorHow many rolls of wallpaper you need, counting whole drops and pattern repeat.Flooring CalculatorBoxes of laminate, vinyl or wood for several rooms, with waste, underlay and skirting.Gravel, Mulch & Soil CalculatorVolume, tonnes and bags of gravel, mulch, topsoil or sand for any area and depth.Fence CalculatorPosts, panels, rails, pickets and post-hole concrete for a fence with gates.Roofing CalculatorRoof area from footprint and pitch, squares, shingle bundles, tiles and rafter length.Drywall CalculatorDrywall or plasterboard sheets for a room, with screws, tape and joint compound.Brick CalculatorBricks or blocks for a wall with joints, single or double skin, waste and mortar.Stair CalculatorRisers, treads, run, stringer length and angle, checked against IRC or UK rules.Board Foot CalculatorBoard feet and cost for a lumber list, plus cubic metres and cubic feet.Pool Volume CalculatorPool water in litres and gallons for any shape and slope, plus fill time and cost.Tire Size CalculatorTyre diameter, sidewall and revs per mile, and speedometer error between two sizes.Coffee Ratio CalculatorCoffee and water for pour-over, French press, AeroPress, cold brew and espresso.Pizza Dough CalculatorFlour, water, salt and yeast for any number of dough balls by baker's percentage.Aquarium CalculatorFish tank volume and true water volume, weight, substrate, heater and filter size.Sourdough CalculatorFlour, water, starter and salt for any loaf size, counting the starter's flour and water.Cake Pan ConverterScale a recipe between round, square and rectangular tins by area.Turkey Roasting CalculatorRoasting and thawing time, servings and a timeline back from dinner.Clothing Size ConverterConvert women's and men's clothing sizes between US, UK, EU, IT, AU and JP.Bra Size CalculatorBand and cup from your measurements in UK, US, EU, FR and AU sizes.Distance Between CoordinatesGreat-circle distance, bearing and midpoint between two lat/long points.Coordinate ConverterConvert lat/long between decimal, DMS, DDM, UTM and geohash.Deck CalculatorDecking boards, joists, screws and cost for a deck, in feet or metres.Plant Spacing CalculatorHow many plants for a bed, border or hedge, in grid or offset rows.Fabric Yardage CalculatorHow much fabric to buy from the pieces you'll cut, in yards or metres.ABV CalculatorHomebrew alcohol by volume from original and final gravity, with attenuation.Curtain Size CalculatorCurtain width and drop from your window, heading style and length.Grass Seed CalculatorHow much grass seed for a new lawn or overseeding, by area and grass type.Pond Liner CalculatorPond liner and underlay size, water volume and pump flow for a garden pond.Rainwater Harvesting CalculatorRainwater you can collect from a roof each year, and the tank size to fit.Rug Size CalculatorThe right rug size for a living room, dining table or bed, to standard sizes.Pool Chlorine CalculatorHow much liquid chlorine, bleach or cal-hypo to raise free chlorine.Paper Weight ConverterConvert paper gsm to US bond, text, cover and index pound weights.Horsepower CalculatorConvert hp, PS, kW and work out power from torque and rpm.CFM CalculatorAirflow in CFM for a room from air changes per hour, or a duct.Pipe Flow CalculatorPipe flow rate, velocity and Hazen–Williams head loss for water.Snow Load CalculatorWeight of snow on a roof from depth and snow type, in kPa and psf.Pressure ConverterConvert psi, bar, kPa, atm, mmHg, inHg and more, all at once.Torque ConverterConvert N·m, lb-ft, lb-in, kgf·m and more, with wrench force.Hat Size ConverterHead size in cm or inches to US, UK, EU and S/M/L hat sizes.Oven Temperature ConverterConvert gas mark, °C, fan °C and °F, with a full oven chart.Carat ConverterCarats to grams, points and grains, plus diamond size in mm.Map Scale CalculatorConvert map distances to real distances for any map scale.Model Scale ConverterConvert real sizes to model scale: HO, N, OO, 1:24, 1:72 and more.Insulation CalculatorInsulation thickness for a target R-value or RSI, and packs needed.Paver CalculatorPavers for a patio or path, plus sub-base, sand and edging.Retaining Wall CalculatorBlocks, caps, drainage gravel and base for a retaining wall.Ladder Angle CalculatorSafe ladder base distance (4-to-1 rule), reach and length.Water Heater Size CalculatorTank size from peak-hour demand, or tankless kW and BTU.Stud CalculatorWall studs at 16 or 24 inch centres, openings, plates and waste.Caulk CalculatorTubes of caulk or sealant for a joint length, width and depth.Rebar CalculatorRebar grid for a slab: bars, stock lengths, weight and ties.Attic Ventilation CalculatorAttic vent NFA with the 1/150 or 1/300 rule, intake and exhaust.Sod CalculatorTurf rolls and pallets for a lawn of rectangles and circles.Light Bulb Lumens CalculatorWatts to lumens for LED, CFL, halogen and old bulbs, and room lumens.LED Bulb Savings CalculatorMoney, energy and CO₂ saved by switching to LED, with payback.Dehumidifier Size CalculatorDehumidifier pints per day for your room size and dampness.Compost CalculatorBalance greens and browns to the ideal compost C:N ratio.Fertilizer CalculatorHow much N-P-K fertilizer to apply for a target nutrient rate.Firewood CalculatorWoodpile volume in cords, face cords and cubic metres, with heat.Tree Age CalculatorEstimate a tree's age from trunk circumference and species.Candle Making CalculatorWax and fragrance oil for a batch of container candles.Soap Lye CalculatorLye and water for cold-process soap from your oils and superfat.Brine CalculatorSalt for any brine percentage, for fermenting, pickling and meat.Yeast ConverterConvert instant, active dry and fresh yeast by grams, teaspoons or packets.Baker's Percentage CalculatorBaker's percentages, hydration and recipe scaling by flour weight.Cake Serving CalculatorServings for round, square, sheet and tiered cakes, and tiers for guests.Meat Cooking Time CalculatorRoasting times and internal temps for beef, lamb, pork and chicken.BBQ Smoking Time CalculatorSmoking times for brisket, pork butt, ribs and more, with start time.Rice to Water Ratio CalculatorWater, cooking time and yield for every kind of rice.Cocktail ABV CalculatorStrength of a mixed drink with dilution, standard drinks and units.Sugar Substitute ConverterSwap sugar for honey, maple, erythritol, allulose and more.Air Fryer ConverterConvert oven recipes to air fryer temperature and time.Slow Cooker ConverterConvert oven or stovetop times to slow cooker LOW and HIGH.

Electronics

Ohm's Law CalculatorEnter any two of volts, amps, ohms and watts — get the rest.Resistor Colour CodeRead a resistor's bands, or find the bands for a value.Solar Panel CalculatorSolar system size and panel count from your usage, with output, cost and payback.Battery Life CalculatorBattery runtime from mAh and load, duty-cycle averaging and power bank charges.Voltage Drop CalculatorVoltage drop and % for copper or aluminium cable by AWG or mm², length and load.LED Resistor CalculatorSeries resistor for LEDs, rounded to E12/E24 values, with power rating.Series & Parallel Resistor CalculatorTotal resistance in series or parallel, and the best E12/E24 pair for a target.Voltage Divider CalculatorOutput voltage from Vin, R1 and R2, or R2 for a target, with load effects.555 Timer CalculatorAstable frequency and duty cycle, monostable pulse width, and design values.RC Filter CalculatorRC low/high-pass cutoff frequency, time constant and capacitor for a target.Capacitor Code CalculatorDecode 104, 473J and 4R7 capacitor markings, and turn values into codes.SMD Resistor Code CalculatorDecode 3-digit, 4-digit, R and EIA-96 surface-mount resistor markings.Decibel CalculatorRatios to dB and back, adding sound levels, and dBm, dBu and dBV.Generator Size CalculatorRunning and starting watts of your appliances and the generator size you need.Watts to Amps CalculatorConvert watts to amps (or amps to watts) for DC, AC and three-phase.Wire Gauge ConverterConvert AWG to mm² and diameter, with copper resistance and a chart.Power Factor CalculatorkW, kVA and kVAR, plus capacitor size to correct power factor.PCB Trace Width CalculatorMinimum PCB trace width for a current (IPC-2221), with resistance.Op-Amp Gain CalculatorInverting and non-inverting op-amp gain, dB and resistor values.Zener Diode CalculatorSeries resistor and power ratings for a Zener voltage regulator.Reactance CalculatorInductive and capacitive reactance and LC resonant frequency.Transformer CalculatorTurns ratio, currents and VA rating for a transformer.Antenna Length CalculatorDipole and quarter-wave antenna lengths for any frequency.Speaker Impedance CalculatorSpeaker wiring impedance: series, parallel and series-parallel.Battery Bank CalculatorSeries/parallel battery pack voltage, Ah, Wh and runtime.

Health & everyday

BMI CalculatorBody mass index in metric or imperial, with what the number does and doesn't mean.Calorie CalculatorYour daily calories (BMR and TDEE) from the Mifflin-St Jeor equation.Macro CalculatorSplit daily calories into protein, carbs and fat by goal — in grams.Protein CalculatorDaily protein by weight and goal, with the evidence ranges stated.One Rep MaxEstimate your 1RM from any set — with the percentage training table.Body Fat CalculatorThe US Navy tape-measure method, with its accuracy stated honestly.Heart Rate ZonesYour five training zones from age — with the Karvonen method built in.Water IntakeA daily fluid estimate from weight and activity — honestly framed.Running Pace CalculatorPace, time or distance — enter two, get the third, with race splits.Sleep CalculatorThe best times to fall asleep or wake, counted in sleep cycles.Work Hours CalculatorAdd up shifts, subtract breaks, and total the week in decimal hours.Feels-Like TemperatureWind chill and heat index from the official formulas — auto-chosen.White NoiseWhite, pink and brown noise with a sleep timer — synthesised, seamless.Online RulerA real-size ruler on your screen, in centimetres or inches.Aspect Ratio CalculatorResize while keeping proportions, and find the ratio of any size.MetronomeA steady click at any tempo, with accents and tap-tempo.BPM CounterTap along to any song and read its tempo — outliers dropped.Download Time CalculatorHow long a file takes at your connection speed — Mbps vs MB/s untangled.Habit TrackerTick off daily habits and watch your streaks grow — saved on this device.Shopping ListA grocery list grouped by aisle, saved on your phone, with quantities and ticks.Meal PlannerWeekly meal plan grid that builds its own shopping list.Packing ListA trip packing list generated from trip type, days and weather — tick as you pack.Caffeine CalculatorHow much caffeine is still in you through the day and at bedtime.Pregnancy Due Date CalculatorDue date from last period, conception or IVF transfer, with week and trimester.Weekly PlannerA printable week grid: hours by days, type into cells, add priorities and notes.Chore ChartA fair rota: people and chores assigned in rotation, ticked off and printed.Workout LogLog sets, reps and weight; track personal bests, estimated 1RM and session volume.Ideal Weight CalculatorDevine, Robinson, Miller and Hamwi formulas side by side, plus the healthy BMI range.Blood Alcohol CalculatorEducational BAC estimate from drinks, weight and time using the Widmark formula.Calories Burned CalculatorCalories used by 28 activities from MET values, weight and minutes, with a day log.Steps CalculatorSteps to km or miles and back, from your stride, with walking time and calories.Fasting TimerIntermittent fasting timer for 16:8, 18:6, 20:4 and more, with history and streak.Ovulation CalculatorEstimated ovulation, fertile window and next six periods on a calendar.Waist-to-Height Ratio CalculatorWaist ÷ height with NICE health bands and the waist size to stay under.Blood Pressure CheckerClassify blood pressure readings by AHA category and average several readings.Pregnancy Weight Gain CalculatorRecommended pregnancy weight gain by BMI and week, for one baby or twins.Child Height PredictorPredict a child's adult height from the parents' heights, with the likely range.VO2 Max CalculatorEstimate VO2 max from a Cooper run, Rockport walk or resting heart rate.Daily PlannerA printable day plan: top 3, hourly schedule, to-dos, water, mood and notes.Party Food CalculatorHow much food, drinks and ice to buy for a party of any size and length.Moving Boxes CalculatorHow many boxes, tape rolls and packing paper you need for a move.Body Surface Area CalculatorBSA in m² from height and weight by Mosteller, Du Bois, Haycock and more.Alcohol Units CalculatorUK units, US standard drinks, grams and calories for the drinks you had.Conception Date CalculatorEstimate when conception happened from a due date, last period or birth date.Race Time PredictorPredict 5K, 10K, half and marathon times from one race with Riegel's formula.Lean Body Mass CalculatorLean body mass from height and weight by Boer, James and Hume, or body fat %.FFMI CalculatorFat-free mass index and the height-normalised FFMI from weight and body fat.Waist-to-Hip Ratio CalculatorWaist-to-hip ratio with WHO health-risk thresholds for men and women.Golf Handicap CalculatorWorld Handicap System index from your rounds, plus a course handicap.Bowling Score CalculatorScore a ten-pin game frame by frame with strikes, spares and the tenth.TV Viewing Distance CalculatorBest seating distance for a TV size, or the best TV size for your room.Bike Gear CalculatorGear ratios, gear inches, rollout and speed at cadence for every gear.BPM to Delay CalculatorDelay and reverb times in ms for every note value at any tempo, with tap tempo.Video File Size CalculatorFile size from bitrate and length, or the bitrate to hit a target size.Shift Schedule GeneratorRotating shift calendars: 2-2-3 Panama, 4 on 4 off, DuPont, 24/48 and custom.Recipe Card MakerPrint recipes on 4×6 or 5×7 index cards, A6, A5 or a full page.Medication Schedule MakerA printable weekly medicine chart with tick boxes for every dose.Reward Chart MakerPrintable star or sticker charts for kids: goals, days and a reward.Baby TrackerLog breastfeeds, bottles, nappies and sleep with one tap; saved on your phone.Calorie Deficit CalculatorHow long to reach a goal weight at a daily calorie deficit, with a goal date.Net Carbs CalculatorCarbs minus fibre and sugar alcohols, for US or UK/EU food labels.Sleep Debt CalculatorYour weekly sleep shortfall against your sleep need, with a recovery plan.Blood Sugar ConverterGlucose mg/dL to mmol/L and back, with fasting and after-meal ranges.A1c CalculatorHbA1c % to mmol/mol and estimated average glucose, both ways.Cholesterol Ratio CalculatorTotal/HDL ratio, non-HDL, LDL estimate and triglyceride ratio from a lipid test.Baby Formula CalculatorDaily formula amounts by weight and age, per feed, with scoops.Baby Sleep CalculatorA sample nap schedule and bedtime from your baby's age and wake time.Cycling Power CalculatorWatts needed for a speed, or speed from watts, with W/kg and drag split.Swim Pace CalculatorPace per 100 m or yd, race and triathlon swim times, and Critical Swim Speed.Workout GeneratorA random home workout for your time, focus and level, with a timer.Dew Point CalculatorDew point, absolute humidity and humidex from temperature and RH.Luggage Size CheckerCheck a bag against carry-on or checked size and weight limits.Hiking Time CalculatorHike duration from distance and ascent with Naismith's rule.Plug Type FinderPlug types, voltage and adapter needs for countries worldwide.Altitude Oxygen CalculatorEffective oxygen and air pressure at any altitude.Period TrackerPrivate cycle tracker with predictions and calendar.Mood & Gratitude JournalDaily mood, gratitude notes and patterns over time.Water Intake TrackerDaily water goal, one-tap logging and streaks.Weight TrackerLog weigh-ins and see the real trend and goal date.Blood Pressure LogHome BP diary with averages, chart and printable report.Running Plan GeneratorCouch to 5K, 10K, half and marathon training plans.

Random & Fun

77 toolsView all →

Let the machine decide.

Decide

Coin FlipHeads or tails, with a running tally of the results.Dice RollerRoll d4 to d100, several at once, with the totals worked out.Random PickerDrop in a list and let the wheel choose a winner.Draw LotsPull a straw and see who wins — or loses — without an argument.Magic 8 BallAsk a yes-or-no question and shake for the answer.

Games

Rock Paper ScissorsPlay against the computer, with a running score.Tic-Tac-ToeNoughts and crosses against the computer — easy or unbeatable.Connect FourDrop discs, make four — versus the computer or a friend on one screen.CheckersDraughts with forced captures, multi-jumps and kings — vs AI or 2P.ReversiFlip discs, take corners — versus a corner-savvy AI or a friend.Dots and BoxesThe pencil classic — close a box, go again. Chains decide everything.MancalaSow seeds, capture, chain extra turns — one of Earth's oldest games.MinesweeperThe classic. Clear the board without hitting a mine.2048Slide tiles, merge numbers, chase the 2048 tile.SnakeThe classic snake game — keyboard or swipe, speed ramps, best saved.BreakoutPaddle, ball, bricks — the 1976 classic with levels and lives.PongThe 1972 classic versus a beatable AI — first to seven.SolitaireKlondike with smart click-moves, undo, draw-3 — the desktop classic.Yacht Dice GameFive dice, three rolls, thirteen categories — chase the upper bonus.HangmanThe classic word game with a win streak that survives on your device.Word GuessThe five-letter game with unlimited words — green, amber, six tries.Word ScrambleUnscramble everyday words against your streak — hints if you must.Memory MatchThe emoji pairs game — moves, timer, and best results per board.Trivia Quiz50 general-knowledge questions, four choices, streaks and high scores.Flag Quiz94 countries, four choices, streaks — geography the sticky way.Fidget SpinnerFlick the spinner, watch it go. That's it. That's the tool.Love CalculatorTwo names in, compatibility percentage out. For fun only.Virtual PianoA playable online piano — mouse, touch or keyboard, chords included.Drum PadEight synthesised drums on pads and keys — kick, snare, hats, cowbell.Chord TransposerShift a whole chord sheet between keys — capo math included.Whack-a-MoleA 30-second reflex game: whack the moles, grab stars, dodge bombs.BattleshipPlay Battleship against a hunt-and-target computer on a 10×10 grid.BlackjackFree blackjack with play chips, 3:2 blackjack and basic-strategy hints.Block StackOne-tap stacking game: drop blocks precisely to build the tallest tower.

Puzzles

SudokuFresh puzzles with a guaranteed unique solution, in three difficulties.15 PuzzleThe sliding classic, always solvable, with moves and time tracked.Tower of HanoiThe 1883 puzzle — move the tower in as few moves as the maths allows.Lights OutPress a light, five flip. Darken the board — every puzzle solvable.Maze GeneratorPerfect mazes on screen and as printable PDFs — solutions included.Jigsaw PuzzleTurn any photo into a jigsaw with real tabs and drag the pieces into place.NonogramPicture logic puzzles: fill squares to match the row and column clues.Crossword MakerMake a printable crossword from your words and clues.Cryptogram MakerTurn a quote into a printable cryptogram puzzle.

Jokes & words

Dad Jokes60 certified groaners, one at a time, no repeats until the barrel empties.RiddlesClassic riddles with tap-to-reveal answers — easy and head-scratcher decks.Tongue TwistersClassics and lab-tested menaces, with a three-times-fast counter.Fortune CookieCrack a cookie for a fortune and lucky numbers. Entertainment grade.Random QuotesPublic-domain wisdom, honestly attributed — Stoics to Edison.

Generate

Random NumberPick random numbers in any range, with or without repeats.Random LetterDraw random letters of the alphabet — great for games.Lottery Number GeneratorQuick-pick number sets for any lottery format.Random Name GeneratorRealistic full names for test data, characters and placeholders.Password GeneratorStrong passwords from your browser's crypto RNG. Never sent anywhere.Password StrengthSee how strong a password really is, and how long it would take to crack.Random Date GeneratorRandom dates between two dates — weekdays, unique, sorted, any format.Business Name GeneratorBrandable business name ideas from your keywords: blends, compounds and more.Username GeneratorUsername ideas from your name or keywords, checked against each platform's rules.Random Country GeneratorPick random countries with flags and capitals, filtered by continent.Drawing Prompt GeneratorRandom things to draw, from easy subjects to challenge scenes, with a timer.Random Coordinate GeneratorRandom latitude/longitude points worldwide, in a box or radius, with CSV and GeoJSON.

Party & groups

Team GeneratorSplit a list of names into fair random teams or groups.Secret Santa GeneratorDraw gift-exchange pairs with no one getting themselves.Truth or DareFamily-friendly truth or dare prompts that never repeat until used up.Never Have I EverClean prompts for the fingers-up game — no repeats until the deck's done.Would You RatherFamily-friendly dilemmas with a live vote tally for the room.Charades GeneratorWords by category and difficulty, with a built-in round timer.Icebreaker QuestionsConversation starters in three depths — strangers, friends, team meetings.Story Fill-InsGive words blind, get a ridiculous story — the classic party format.Letter Lists GameA letter, twelve categories, a timer — unique answers score.Chess ClockA two-player game clock with increments and presets.ScoreboardKeep score for any game, with as many players or teams as you need.Tally CounterCount things by tapping — several counters at once, saved as you go.Bingo Card GeneratorPrint unique 75-ball bingo cards for game night.Tournament Bracket GeneratorSingle-elimination brackets with seeding and byes; click winners through.Round Robin SchedulerLeague fixtures where everyone plays everyone, with byes, home/away and dates.Seating Chart MakerPlan wedding tables or classroom seats: keep parties together, swap, print.Team Name GeneratorTeam names for work, quiz nights, sports, gaming and charity events.

Web & Encoding

222 toolsView all →

Encode, hash, convert and compress — all in the browser.

Generators & codes

QR Code GeneratorTurn a link, message or Wi-Fi login into a QR code you can download.WiFi QR CodeA QR code that connects guests to your WiFi in one scan — made locally.vCard QR CodeA contact QR code — scan it and the phone offers to save your details.Barcode GeneratorMake a scannable Code 128 or EAN-13 barcode and download it.UUID GeneratorGenerate v4 UUIDs and other random IDs from your browser's crypto RNG.Favicon GeneratorTurn any image or emoji into a full favicon set, with a real .ico.Email Link BuilderBuild a mailto link with subject, body and recipients already filled in.Email SignatureA clean HTML signature that survives Outlook — copy with formatting.Meta Tag GeneratorTitle, description, Open Graph and Twitter tags from one form.UTM BuilderCampaign URLs without the typos — lowercase enforced, conventions kept.WhatsApp Link Generatorwa.me click-to-chat link with a pre-filled message, HTML button and QR code.Add to Calendar Link GeneratorGoogle, Outlook, Office 365 and Yahoo links plus an .ics file from one form.TOTP Code GeneratorAuthenticator codes from a Base32 secret or otpauth URI, computed on device.Nano ID GeneratorShort, secure random IDs with custom alphabet and length, plus collision odds.ULID GeneratorSortable ULIDs from the crypto RNG, and decode a ULID's timestamp.SRI Hash GeneratorSubresource Integrity hashes and script/link tags for CDN files.Random String GeneratorSecure random strings, tokens and API keys in bulk: hex, base64url, custom.PKCE GeneratorOAuth PKCE code_verifier and S256 code_challenge, with state and nonce.MAC Address GeneratorRandom locally administered MAC addresses, plus a MAC checker.Random IP GeneratorRandom public, private or documentation IPv4/IPv6 addresses in bulk.

SEO & marketing

SERP Snippet PreviewSee your title and description as a Google result, measured in pixels.Schema Markup GeneratorJSON-LD for FAQ, Article, Product, Local business, Organization, Event, How-to.Keyword Density CheckerWord and phrase frequencies with percentages and a target keyword check.Social Media Character CounterEvery platform's limit at once: X, Instagram, LinkedIn, TikTok, ads, SEO.Headline AnalyzerScore a headline or subject line on length, numbers, power words — rules shown.Email List CleanerDedupe, validate and fix typos in a mailing list; flag role and disposable addresses.Link in Bio Page GeneratorBuild a link-in-bio page as one HTML file you host anywhere — no tracking.Google Review Link GeneratorDirect ‘write a review’ link from your Place ID, plus a QR code and counter card.Bulk QR Code GeneratorHundreds of QR codes from a list or CSV, named by label, zipped with an index.Hashtag GeneratorHashtags from your caption plus niche sets, de-duplicated and checked per platform.Email Subject Line TesterLength, spam phrases, caps and preview text, with phone and desktop inbox previews.Redirect Generator301 redirect rules for Apache, Nginx, Netlify, Vercel and IIS, with loop checks.Open Graph PreviewSee your link card on Facebook, LinkedIn, X, Slack and WhatsApp, with checks.Hreflang Tag GeneratorHreflang link tags, sitemap entries or HTTP headers, with code validation.llms.txt GeneratorBuild an /llms.txt file that helps AI assistants understand your site.Slogan GeneratorSlogans and taglines from your brand, product and main benefit.Keyword CombinerMix lists of words into every keyword combination for ads and SEO.Keyword Match Type GeneratorBroad, “phrase”, [exact] and negative keywords for Google and Microsoft Ads.robots.txt TesterTest URLs against a robots.txt for Googlebot, Bingbot or AI crawlers.Sitemap ValidatorValidate a sitemap.xml: XML, URLs, lastmod, duplicates and limits.SEO Meta AnalyzerAudit a page's title, description, canonical, robots, OG and schema tags.Heading Structure CheckerSee a page's H1–H6 outline and catch skipped levels and missing H1s.Alt Text CheckerAudit image alt text in HTML: missing, empty, file names and links.

Encode & decode

Base64 EncoderEncode and decode Base64, including files and non-English text.URL EncoderPercent-encode and decode URLs, with a query-string breakdown.HTML Entity EncoderEscape text for HTML, or decode entities back to characters.Text to BinaryConvert text to binary, hex or decimal — and back again.Number Base ConverterConvert between binary, octal, decimal, hexadecimal and any base.Roman NumeralsConvert numbers to Roman numerals and read them back.Number to WordsWrite a number out in words, for cheques, contracts and invoices.Base32 Encoder / DecoderEncode and decode Base32 — RFC 4648, Base32hex or Crockford — for text or hex.String EscaperEscape or unescape text for JSON, JS, HTML, XML, URL, regex, SQL, CSV and shell.Unicode InspectorSee every character's code point, bytes and escapes, and spot hidden characters.SVG to Data URITurn SVG into a compact URL-encoded or base64 data URI with ready CSS.Base58 Encoder / DecoderEncode and decode Base58 and Base58Check (Bitcoin, IPFS) online.Punycode ConverterConvert international domain names to xn-- Punycode and back.Endian ConverterBig-endian and little-endian bytes for integers and floats, and byte swaps.UUID DecoderDecode a UUID or ULID: version, variant and embedded timestamp.MRZ ParserDecode passport and ID card MRZ lines and verify every check digit.VAT Number ValidatorCheck EU, UK, Swiss and Norwegian VAT numbers' format and check digits.VIN DecoderDecode a VIN offline: manufacturer, region, model year and check digit.ABA Routing Number ValidatorValidate US bank routing numbers with the checksum and Fed district.SWIFT / BIC ValidatorCheck SWIFT/BIC code structure, country, location and branch.NHS Number ValidatorValidate NHS numbers with the modulus 11 check and make test numbers.ISIN ValidatorValidate ISINs and the CUSIP or SEDOL inside them, with the country.UK Postcode CheckerValidate and format UK postcodes in bulk and see the postcode area.Phone Number FormatterConvert phone numbers to E.164 and readable formats, with call links.NI Number CheckerCheck UK National Insurance number format and prefix rules.

Hashing & encryption

Hash GeneratorSHA-1, SHA-256, SHA-384 and SHA-512 checksums of text or files.MD5 & CRC32Legacy checksums for verifying downloads and old file listings.Encrypt a FileLock a file with a password using AES-256, entirely in your browser.Encrypt a MessageEncrypt text with a password — AES-GCM, all in your browser.JWT DecoderDecode a JSON Web Token's header and payload — locally.Passphrase GeneratorRandom word passphrases with honest entropy math — generated locally.HMAC GeneratorHMAC-SHA256/384/512/1 as hex and Base64, and verify a webhook signature.JWT EncoderBuild and sign a JSON Web Token with HS256, HS384 or HS512 for testing.PBKDF2 Hash GeneratorDerive PBKDF2-HMAC keys with salt and iterations, as hex, base64 or PHC.

Developer

JSON FormatterPretty-print, minify and validate JSON, with errors pinpointed.CSV to JSONConvert CSV to JSON and back, with quoting handled properly.JSON to CSVFlatten a JSON array into spreadsheet-ready CSV — free, in your browser.XML FormatterValidate, pretty-print or minify XML with real error messages.SQL FormatterUppercase keywords, clean clause layout — strings never touched.HTML PreviewA live sandboxed HTML/CSS/JS scratchpad — type left, render right.Markdown Table GeneratorEdit a grid, get aligned Markdown — alignment colons done right.Regex TesterTest a regular expression live, with every match and capture group shown.Timestamp ConverterConvert Unix timestamps to dates and back, in any time zone.Cron Expression ExplainerPaste a cron expression and read it in plain English.What Is My User AgentYour browser's user agent string and what it reveals.URL ParserSplit any URL into parts with query parameters decoded into a table.Hex ViewerAny file's raw bytes — offset, hex, ASCII, and its magic number.Subnet CalculatorCIDR in — mask, network, broadcast, host range and counts out.chmod CalculatorTick permissions and get the chmod number — 755, 644 and friends explained.ASCII TableThe full ASCII table — dec, hex, oct, binary — searchable and copyable.HTTP Status CodesEvery status code that matters — searchable, explained, copyable.XML to JSONConvert XML to clean JSON with a real parser and honest conventions.JSON to XMLConvert JSON to well-formed, verified XML — attributes and all.YAML to JSONConvert YAML configs to JSON — docker-compose, CI files, manifests.JSON to YAMLConvert JSON to idiomatic YAML with the quoting handled correctly.HTML to MarkdownTurn HTML into clean Markdown — headings, links, lists, tables.JSON to TypeScriptGenerate TypeScript interfaces from a JSON sample — optionals detected.JavaScript MinifierSafely minify JavaScript — comments and whitespace out, nothing rewritten.HTML FormatterPretty-print or minify HTML — with pre, script and style left intact.Port Number ReferenceThe network ports worth knowing — searchable, with honest warnings.CSV ViewerOpen a CSV as a sortable, filterable table without Excel — nothing uploaded.JSON DiffCompare two JSON documents by structure — key order and formatting ignored.Subtitle ConverterConvert SRT to VTT (and back) and shift subtitle timing by any offset.Robots.txt GeneratorBuild a valid robots.txt with sitemap, crawl delay and AI-crawler options.XML Sitemap GeneratorTurn a list of URLs into a valid sitemap.xml — escaped, deduplicated.Excel to CSVConvert every sheet of an .xlsx to CSV without Excel — dates and quotes handled.CSV to ExcelTurn CSV into a real .xlsx with numbers as numbers — leading zeros protected.Excel to JSONSpreadsheet rows to JSON objects, first row as keys — on your device.CSV MergerCombine CSV files: stack rows by header or join on a key column; export Excel.JSON Schema GeneratorInfer a Draft 2020-12 or draft-07 JSON Schema from sample JSON, with formats.Cron Expression GeneratorBuild a cron schedule from choices, read it in plain English and see the next runs..gitignore GeneratorCombine templates for languages, frameworks, editors and OSes into one clean .gitignore.License GeneratorMIT, ISC, BSD and Unlicense text with your name; Apache, GPL and MPL notices.README GeneratorA structured README.md with badges, features, install, usage, contributing and license.cURL to CodeConvert a curl command to JavaScript fetch, Python requests, axios, PHP or Go.CSV to SQLCREATE TABLE with inferred types and INSERTs for MySQL, Postgres, SQLite, SQL Server.security.txt GeneratorAn RFC 9116 security.txt with Contact, Expires and policy fields, validated.Web App Manifest Generatormanifest.json for a PWA with icons, colours and display mode, plus checks.JSONPath TesterRun JSONPath queries with filters and slices on your JSON and see each match.HTML Table GeneratorBuild an accessible HTML table from a grid or pasted CSV, with styles and preview.TOML ⇄ JSON ConverterConvert TOML to JSON and JSON to TOML, with line-numbered error messages.Semver CalculatorSort and compare semantic versions, bump them, and test npm ranges like ^1.2.0.IP Address ConverterIPv4 to decimal, hex and binary, IPv6 expand and compress, address type.Browser Feature CheckerWhich web APIs, CSS features and codecs your browser supports, with a report.CSP Header GeneratorBuild a Content-Security-Policy with warnings and server-ready snippets.MIME Type LookupExtension ↔ MIME type search, and identify a file from its magic bytes.Keycode FinderPress a key to see event.key, event.code, keyCode and modifiers.Mock Data GeneratorFake test records as JSON, CSV or SQL, with safe emails and phone numbers.Check Digit CalculatorCompute or validate Luhn, ISBN, EAN/UPC, GTIN, ISSN, IBAN and VIN check digits.HTML to JSX ConverterConvert HTML to valid React JSX: className, style objects, self-closing tags.SVG to JSX ConverterTurn an SVG into a React component with props, currentColor and TypeScript.JSON to Go StructGenerate Go structs with json tags, omitempty and pointers from a JSON sample.JSON to Python ClassDataclasses, Pydantic models or TypedDicts generated from a JSON sample.RSA Key GeneratorRSA or Ed25519 key pairs in PEM, JWK and OpenSSH formats, made in your browser.SSL Certificate DecoderDecode PEM certificates and CSRs: SANs, expiry, issuer, key size, fingerprints.Docker Run to ComposeConvert docker run commands into a compose.yaml with ports, volumes and env.NDJSON / JSON Lines ConverterConvert JSON arrays to NDJSON (JSONL) and back, with line-by-line validation.CSV SplitterSplit a big CSV by rows, into N files or by column value; header kept, ZIP download.Delimiter ConverterConvert CSV, TSV, semicolon and pipe-separated text with correct quoting.Pricing Table GeneratorBuild a responsive pricing table and copy self-contained HTML and CSS.Plain Text Table GeneratorCSV or spreadsheet cells to an aligned ASCII or box-drawing text table.JSON to C#C# classes with System.Text.Json or Newtonsoft attributes from JSON.JSON to JavaJava POJOs or records with Jackson annotations from a JSON sample.JSON to KotlinKotlin data classes for kotlinx.serialization, Gson or Moshi.JSON to RustRust structs with serde derives, Option and Vec, from JSON.JSON to SwiftSwift Codable structs with CodingKeys from a JSON sample.JSON to DartNull-safe Dart models with fromJson and toJson, ready for Flutter.JSON to ZodZod schemas and inferred TypeScript types from a JSON sample.JSON to PHPPHP 8 classes with typed properties and a fromArray factory.JSON to GraphQLGraphQL schema types (SDL) inferred from a JSON sample.JSON to HTML TableTurn a JSON array into an escaped HTML table with a live preview.JSON5 to JSONConvert JSON5 or JSONC (comments, trailing commas) to strict JSON and back.INI to JSONConvert INI, .cfg and .conf files to JSON and JSON back to INI..env ConverterConvert .env files to JSON, YAML, shell, Docker, Compose or Kubernetes env.Line Ending ConverterConvert CRLF/LF line endings, tabs/spaces, trailing whitespace and BOM.GraphQL FormatterPretty-print or minify GraphQL queries, fragments and schema SDL.SQL INSERT to CSVExtract rows from SQL INSERT statements or dumps into CSV or JSON.Markdown TOC GeneratorTable of contents for Markdown with GitHub-style anchor links.Query String BuilderBuild or edit URL query strings with correct encoding and arrays.HTTP Headers AnalyzerParse raw HTTP headers with explanations, cookies and a security check.HAR File ViewerView HAR files from DevTools and download a sanitised copy.IP Range to CIDRConvert IP ranges to the smallest CIDR list, and CIDR back to ranges.Kubernetes YAML GeneratorDeployment, Service, Ingress and autoscaler manifests for a web app.nginx Config Generatornginx server blocks for reverse proxy, static, SPA or PHP, with HTTPS.systemd Service GeneratorCreate a systemd .service (or .timer) unit with restart and hardening.SSH Config GeneratorBuild ~/.ssh/config Host entries with keys, ports and ProxyJump..editorconfig GeneratorCreate an .editorconfig for indentation, line endings and charset.Prettier Config GeneratorBuild a minimal .prettierrc with only the options you change.Changelog GeneratorTurn Conventional Commits into a Keep a Changelog release section.Commit Message GeneratorWrite Conventional Commits messages with length and style checks..gitattributes GeneratorLine-ending normalisation, binary files, Git LFS and diff settings.Email Header AnalyzerRead SPF, DKIM, DMARC results and the delivery path from email headers.SPF Record GeneratorBuild an SPF TXT record for your email services, with a lookup count.DMARC Record GeneratorCreate a _dmarc TXT record with policy, reports and alignment.YouTube Embed GeneratorResponsive, privacy-enhanced YouTube embed code with start time and options.Image srcset GeneratorResponsive img srcset/sizes and picture markup with AVIF and WebP.Bandwidth CalculatorMonthly transfer and peak Mbps for a website or video stream.

CSS & colour

Color ConverterHEX, RGB and HSL in step, with shades and a contrast checker.CSS Gradient GeneratorBuild linear and radial gradients visually and copy the CSS.Box Shadow GeneratorDesign layered CSS box-shadows with a live preview.CSS MinifierMinify CSS safely — strip comments and whitespace, nothing rewritten.Random Color GeneratorRandom colours and five-swatch palettes with locking — hex, RGB, HSL.px to rem ConverterPixels to rem and back at any root size, with a copyable table.Blob GeneratorOrganic SVG shapes for backgrounds and heroes — copy or download.SVG Wave GeneratorSmooth wavy section dividers — layered, tintable, copy or download.Cubic Bezier EasingShape CSS easing curves and race them against linear — then copy.Flexbox PlaygroundFlip flexbox properties, watch real boxes move, copy the CSS.CSS Grid GeneratorColumns, rows and gap — live preview, editable fr tracks, copy the code.Colour Scheme GeneratorComplementary, analogous, triadic and monochrome palettes with contrast ratios.Type Scale GeneratorA modular type scale from a base size and ratio, optionally fluid with CSS clamp().CSS Clip-Path GeneratorPreset and draggable polygon, circle, ellipse and inset shapes, copied as CSS.CSS Button GeneratorDesign a button with colours, radius, shadow and hover; copy CSS with a contrast check.CSS Triangle GeneratorCSS triangles in eight directions using the border trick or clip-path.CSS Loader GeneratorPure-CSS spinners and loading bars with size, speed and colour, accessible markup.Border Radius GeneratorRound each corner, elliptical or not, and copy the shortest border-radius.Glassmorphism GeneratorFrosted-glass CSS with backdrop blur, transparency and border, plus a fallback.Neumorphism GeneratorSoft UI shadows from one colour: flat, pressed, concave or convex.CSS Specificity CalculatorSpecificity of CSS selectors, including :is, :not, :has and :where.CSS Text Shadow GeneratorLayered text shadows with neon, 3D, outline and retro presets.CSS Filter GeneratorFilter sliders with live preview, plus hex colour to CSS filter for icons.CSS Animation GeneratorKeyframe animations (bounce, pulse, shake, fade…) with timing controls and CSS.SVG Pattern GeneratorSeamless background patterns as tiny SVG — copy CSS or download.Mesh Gradient GeneratorSoft multi-colour mesh backgrounds with draggable points, as CSS or PNG.Tailwind Color GeneratorA 50–950 Tailwind shade palette from one colour, in OKLCH, for v3 or v4.CSS Clamp GeneratorFluid font sizes and spacing with clamp(), rem + vw, live preview and type scale.Colour Name FinderThe name of any colour: nearest CSS colour names and a plain description.Contrast CheckerWCAG contrast ratio for text and background, AA/AAA results and fixes.CSS Toggle Switch GeneratorAccessible on/off toggle switches in pure CSS on a real checkbox.CSS Scrollbar GeneratorCustom scrollbar CSS with scrollbar-color and ::-webkit-scrollbar.Text Gradient GeneratorGradient-filled text with background-clip, optional shimmer animation.CSS Tooltip GeneratorPure-CSS tooltips with arrows, shown on hover and keyboard focus.Gradient Border GeneratorRounded gradient borders in CSS, including animated spinning borders.Colour MixerMix two colours at any ratio in sRGB, linear or OKLab, with steps.SVG Path VisualizerSee an SVG path drawn with points, handles and every command explained.CSS Transform GeneratorBuild CSS transforms visually: translate, rotate, scale, skew and 3D.CSS Checkbox GeneratorCustom-styled checkboxes and radio buttons that stay accessible.

Archives & files

Create a ZIPBundle several files into one ZIP archive without uploading them.Unzip a FileOpen a ZIP archive and pull out the files, all in the browser.Batch Rename FilesRename many files at once with numbering, then download them as a ZIP.

Images & Files

216 toolsView all →

Crop, blur, convert and record — without uploading anything.

Edit a photo

Image CropperCrop, rotate and flip a photo to any size or aspect ratio.Image ResizerResize and compress images without uploading them anywhere.Rotate & Flip ImageRotate images in 90° steps or mirror them — free, exact, no upload.Straighten a PhotoFix a crooked horizon by rotating a degree at a time, then crop it clean.Circle CropCrop a photo into a perfect circle for a profile picture or avatar.Blur & PixelateHide faces, names or numbers in a screenshot before you share it.Photo FiltersBrightness, contrast, saturation and one-tap looks — edited on your device.Add WatermarkStamp text over a photo before you send it, tiled or in one corner.Add Date to PhotoStamp a date onto a photo, retro camera style or plain.Add Border to ImageFrame a photo with a border and optional mat — any width, any colour.Rounded CornersRound an image's corners with real transparency — up to a full circle.Sharpen ImageCrispen soft photos with a real convolution filter — honest about limits.VignetteDarken the edges so the eye goes to the centre — classic photo mood.Annotate ImageArrows, boxes, circles and labels on a screenshot — undo included.Background RemoverCut the background out of a photo — AI on your device or colour key. No upload.Color ReplacerClick a colour in an image and swap it for another, shading kept.Image BlurSoften a whole image with an adjustable Gaussian blur, on your device.Face BlurFind faces automatically and blur, pixelate or box them out — AI on your device.Photo EnhancerOne-press auto levels, white balance, contrast and colour — adjustable, on your device.Image UpscalerEnlarge an image 2×, 3× or 4× with Lanczos resampling and sharpening — no upload.Background ChangerCut out the subject with on-device AI and put it on a colour, gradient, blur or photo.Image DPI ChangerSet a JPG or PNG to 300 DPI (or any value) without changing its pixels.

Effects

Duotone EffectMap a photo onto two colours — the poster look, with presets.Dither Image1-bit black & white via Floyd–Steinberg — retro Mac, zine and e-ink looks.PosterizeCrush a photo to a few flat tone levels — the screen-print look.Photo to SketchThe classic pencil-drawing effect — real image math, no AI, no upload.Image to ASCII ArtRebuild a picture out of text characters — copy it anywhere monospace.Pixel Art ScalerEnlarge sprites and pixel art with perfectly hard edges — zero blur.

Create

Photo Collage MakerArrange several photos into one image, in a grid you choose.Meme GeneratorClassic top and bottom text on your own image. No watermark.WhiteboardA simple drawing board — sketch, erase, undo and save as PNG.Signature MakerDraw your signature and download it as a transparent PNG.Split Image into GridSlice a photo into tiles for an Instagram grid or a puzzle layout.Placeholder ImagesLabelled dummy images at any size — generated locally, no service.Text to ImageRender text as a PNG — font, colours, transparent background option.Screenshot BeautifierGradient background, rounded corners, shadow, window chrome — in one pass.Noise TextureGenerate film-grain PNGs — transparent overlays that kill colour banding.Polaroid FrameThe instant-photo frame with a handwritten caption and a tilt.Image MergerJoin images side by side or stacked — sizes matched, gap and background yours.Pixel Art EditorDraw pixel art on an 8, 16 or 32 grid and export a crisp transparent PNG.Social Image GeneratorMake Open Graph, Twitter, square and story images from a headline and your brand.App Icon GeneratorEvery iOS, Android and PWA icon size from one artwork, maskable included — ZIP.Image CompareBefore/after slider for two images, with a labelled side-by-side PNG export.Chart MakerPaste label,value rows and download a bar, line, pie or donut chart as PNG.Gantt Chart MakerTasks with dates become a timeline chart with a today line — PNG and CSV export.Business Card GeneratorDesign a card, download a 300-dpi PNG or a 10-up print sheet with crop marks.Thumbnail Maker1280×720 YouTube thumbnails: photo, bold outlined title, accent bar, cutout.Logo MakerSimple wordmark or monogram logos as SVG and PNG — no watermark, no account.Timeline MakerDated events become a clean timeline graphic, vertical or horizontal, as PNG.Kaleidoscope DrawingDraw with mirrored symmetry in 4–16 segments and save the art as a PNG.SpirographDraw spirograph curves with ring, wheel and pen settings, then save a PNG.Org Chart MakerIndented list of people to a tidy organisation chart, as SVG or PNG.Mind Map MakerTurn an outline into a balanced, colourful mind map; export SVG or PNG.Flowchart MakerWrite steps as text and get an auto-laid-out flowchart; export SVG/PNG.Venn Diagram Maker2 or 3 set Venn diagrams that sort your items into overlaps for you.Initials Avatar GeneratorInitials profile pictures as PNG or SVG, any colour and shape.Sprite Sheet GeneratorPack images into one sprite sheet PNG with CSS and JSON.Device Mockup GeneratorPut a screenshot in a phone, laptop or browser frame.

Convert

WebP ConverterConvert images to WebP, or WebP back to JPEG and PNG.SVG to PNGConvert SVG to a crisp PNG at any size you choose.PNG to JPGConvert PNG images to JPG, picking the background for transparency.JPG to PNGConvert JPG photos to lossless PNG files in one click.Image CompressorShrink JPG and PNG file sizes with a quality slider — free, no upload.Image to Base64Turn any image into a Base64 data URI — and decode Base64 back to an image.AVIF to JPGConvert AVIF images back to universally-supported JPG — several at once.AVIF to PNGConvert AVIF to lossless PNG with transparency kept intact.Image to AVIFEncode JPG, PNG or WebP as AVIF — with an honest browser-support check.BMP to PNGConvert huge uncompressed bitmaps into compact lossless PNGs.ICO to PNGUnpack a favicon or icon file into an ordinary PNG, transparency kept.GIF to PNGSave a GIF as a still PNG — first frame, honestly labelled.PNG to BMPWrite real 24-bit BMP files for the software that accepts nothing else.Compress Image to SizeHit an exact file-size limit — 100 KB, 200 KB, 2 MB — automatically.SVG OptimizerStrip editor junk and excess precision from SVGs — with a visual diff.HEIC to JPGConvert iPhone HEIC/HEIF photos to JPG or PNG in your browser — batch, with ZIP.PNG to SVGTrace a PNG or JPG into a real vector SVG — logos, icons and flat art vectorized.Bulk Image ResizerResize many images at once by longest side, width or percentage — ZIP download.EXIF RemoverStrip GPS location, camera and edit metadata from photos before sharing — batch, ZIP.Social Media Image ResizerOne photo to every Instagram, Facebook, X, LinkedIn and YouTube size, as a ZIP.

PDF

Split PDFExtract pages from a PDF or cut it into pieces — no upload, no limits.Merge PDFCombine PDF files into one, in the order you choose — right in your browser.Delete PDF PagesRemove pages from a PDF and keep the rest untouched — no upload.Rotate PDFFix sideways scans — rotate all pages or a few, with no quality loss.PDF Page NumbersStamp page numbers onto a PDF — position, style and start number.Watermark PDFStamp DRAFT, CONFIDENTIAL or any text across every page of a PDF.PDF MetadataView and edit a PDF's title, author and keywords — or blank them.JPG to PDFTurn photos into a single PDF, in order, without uploading them.PDF to JPGTurn every PDF page into a JPG or PNG image — rendered on your device.Compress PDFShrink a PDF for email with three honest quality levels — no size limits.Sign PDFDraw your signature and place it on any page — the file never leaves your device.Crop PDFDrag a rectangle over what to keep — trim margins and scanner borders.PDF OrganizerSee every page as a thumbnail — reorder and remove visually, then export.Extract Text from PDFPull the selectable text out of a PDF — copy it or save as .txt.PDF Word CountCount words, characters and pages in a PDF, with a per-page breakdown.PDF Fit to PageScale every page to A4, Letter or another size — fit or fill, text stays sharp.PDF N-UpPrint 2, 4, 6 or 9 pages per sheet — handouts and notes that save paper.PDF Booklet MakerReorder pages into fold-in-half booklet spreads — print, fold, staple.PDF InterleaveMerge odd and even scans into reading order — the duplex-scan fix.Reverse PDFFlip the page order, last page first — the backwards-scan fix.PDF to GrayscaleRe-render every page in black and white for clean mono printing.PDF Duplicate FinderFind identical pages in a PDF and export a copy without them.PDF OCRTurn a scanned PDF into text, page by page, with OCR that runs in your browser.PDF to WordGet a PDF's text into an editable .docx with headings and page breaks — no upload.Word to PDFTurn a .docx into a clean paginated PDF on your device — no Word needed.PDF Form FillerFill in the fields of a PDF form and save it, optionally flattened — on your device.PDF RedactionBlack out text and images so they are truly gone — pages re-rendered, not covered.Searchable PDF (OCR)Add an invisible text layer to a scanned PDF so it's searchable and selectable.Document ScannerPhoto of a page → straightened, cleaned, multi-page PDF. On your device.PDF DiffCompare the text of two PDF versions and see every added or removed line.PDF Header & FooterAdd running headers and footers with page numbers, dates and file names to a PDF.Flatten PDFBurn filled-in form fields into the page so the values can no longer be edited.Remove Blank Pages from PDFFind and delete empty pages in scans and exports, with thumbnails to check first.Add Image to PDFPlace a logo, stamp or signature image on PDF pages at any size and opacity.Add Text to PDFClick on any page to place text, then save the PDF — on your device.Add Margins to PDFAdd white space for binding or notes, or shrink content inside the same page size.Bates Numbering for PDFStamp sequential Bates numbers across one or more PDFs for legal discovery.Insert Blank Pages in PDFAdd blank or lined pages after every page, chosen pages, or pad for booklets.Extract Images from PDFSave the embedded photos and graphics from a PDF as PNG files or a ZIP.PDF Scan EffectMake a PDF look printed and scanned: tilt, grain, grey paper, copier look.PDF Dark ModeTurn a PDF into a dark-mode version for night reading.Remove PDF AnnotationsStrip comments, highlights and sticky notes from a PDF.PDF Bookmarks ViewerSee and copy a PDF's bookmarks (outline) with page numbers.PDF Page Size CheckerEvery page's size in mm, inches and points, with paper name.PDF Link ExtractorList every link and email in a PDF, with page numbers.PDF Font ListSee which fonts a PDF uses and whether they're embedded.PDF Page CounterCount pages in many PDFs at once, with totals and print cost.

Video & GIF

Video TrimmerCut a clip out of a video on your device — set start and end, download as WebM.Video CompressorShrink a video for messaging and email with three honest presets. No upload.Video to GIFTurn a moment of video into an animated GIF — pick the seconds, frame rate and size.GIF MakerCombine images into an animated GIF with your own frame delay and size.Video to MP4Convert WebM, MOV and other video to real H.264 MP4 with WebCodecs — on your device.Video RotateRotate a sideways or upside-down video 90°, 180° or 270°, or flip it — no upload.Video Speed ChangerSpeed a video up or slow it down, from 0.25× to 4×, with or without sound.Video CropCrop a video to a region or a ratio preset — vertical 9:16, square, 16:9. No upload.Remove Audio from VideoStrip the soundtrack from a video on your device — a truly silent copy, no upload.Video MergerJoin several clips into one video, in order, on your device — no upload.Video Frame ExtractorSave any frame of a video as a full-size PNG or JPG, or make a contact sheet.Video WatermarkStamp text or a logo onto every frame of a video — position, size, opacity.Video Contact SheetA thumbnail grid of a video with timestamps, saved as one image.GIF InfoFrames, duration, frame rate, loops and delays of any GIF.GIF Speed ChangerSpeed up or slow down a GIF without losing quality.GIF to VideoConvert an animated GIF to an MP4 or WebM video.Video InfoCodec, frame rate, bitrate, rotation and location of a video.Reverse VideoPlay a video clip backwards and download it.Boomerang Video MakerTurn a moment into a forward-and-back looping clip.

Record & audio

Screen RecorderRecord your screen, a window or a tab, with or without sound.Webcam RecorderRecord video from your camera and download it. Nothing uploaded.Voice RecorderRecord audio from your microphone and download it. Nothing uploaded.Audio TrimmerCut a clip out of an audio file — trimmed on your device.Video to AudioExtract the audio track from a video as WAV — no upload, no watermark.Audio to WAVConvert MP3, M4A, OGG or FLAC to universal WAV — decoded on your device.Audio to MP3Convert WAV, M4A, OGG, FLAC or a video's soundtrack to MP3 — encoded on your device.Spectrum AnalyzerLive frequency analysis of your mic or an audio file, with peak readout.Audio Waveform ImageRender sound as a waveform PNG — podcast art, prints, video overlays.

Audio editing

Audio MergerJoin audio files end to end, mixed formats welcome, optional gaps.Audio Speed ChangerSpeed audio up or slow it down, 0.25× to 4× — honest about pitch.Volume BoosterMake quiet audio louder — with a real clipping warning before damage.Audio NormalizerPeak-normalize audio to maximum clean volume in one click.Audio FadeAdd fade-in and fade-out ramps — kill the clicks, smooth the ends.Reverse AudioPlay any audio backwards — the classic tape-flip effect, lossless.Audio LooperRepeat a clip seamlessly with crossfaded joins — 30 seconds into 10 minutes.Silence RemoverCut the dead air out of recordings — threshold and gap controls.Audio EqualizerSix-band EQ with honest presets — bass boost, voice clarity, warmth.Stereo to MonoFold stereo to one channel — mix both or keep just left or right.Audio EchoA real delay line with feedback — slapback to dub, tail preserved.Sample Rate ConverterResample audio to 8, 16, 44.1 or 48 kHz — the speech-to-text prep tool.Audio Noise ReducerRemove hiss, hum and room noise from a recording with spectral gating — on device.Vocal RemoverKaraoke trick: cancel the centred vocal and keep the band — honest about limits.Voice ChangerPitch up or down, chipmunk, giant, robot, telephone, cave, reverse — on your device.Ringtone MakerCut the best 30 seconds of a song with fades and save an MP3 ringtone.MP3 Tag Editor (ID3)Edit an MP3's title, artist, album, year, genre and cover art.8D Audio ConverterMake a song circle around your head on headphones.

Sound generators

Binaural BeatsGenerate binaural beats live or as WAV files — honest about the science.Noise File GeneratorDownload white, pink or brown noise as WAV — sleep, masking, testing.DTMF Tone GeneratorThe phone keypad's dual tones — play, dial sequences, export WAV.Audio Size CalculatorHow big is an hour of audio? Bitrate × duration, every format at once.Chord Progression GeneratorPopular or random chord progressions in any key, with notes and playback.Circle of FifthsInteractive circle of fifths: key signatures, scales, chords and relative minors.Ear TrainerPractise recognising musical intervals by ear, rising, falling or together.Note Frequency CalculatorFrequency of any note (A4 = 440 Hz or custom), or note from Hz.Music Interval CalculatorName the interval between two notes, with ratios and inversion.Guitar Chord ChartGuitar chord diagrams for any key: open and barre shapes.Piano Chord ChartSee any chord on a piano keyboard, with notes and inversions.Chord FinderName the chord from its notes, including inversions.Scale FinderAny scale's notes on piano and fretboard, or find the scale.Note Reading TrainerSight-reading flashcards for treble and bass clef.Drum Machine16-step beat maker with presets, swing and WAV export.

ID & printing

Passport Photo MakerCrop a photo to passport, visa or ID size with the right proportions.Photo Print SheetTile copies of a photo onto one sheet to print and cut out.Printable Graph PaperFree printable graph paper, dot grid and lined paper as exact-scale PDFs.Label MakerAddress or name labels from a list or CSV onto Avery-style sheets, as a PDF.Certificate GeneratorAward, completion and appreciation certificates as PNG or PDF — batch from a list.Name Tag GeneratorName badges on Avery-style sheets from a pasted list, ready to print.Paper SizesA, B, C, Letter, Legal and more in mm, inches, points or pixels.Music Staff PaperPrintable blank staff, grand staff and guitar TAB paper.Calligraphy Guide SheetPrintable calligraphy guidelines sized to your nib and slant.Invitation MakerPrintable birthday, wedding, shower and party invitations.Sign & Poster MakerBig printable signs: Closed, Wet floor, Back soon and more.Tear-Off Flyer MakerPrintable flyers with tear-off contact tabs for notice boards.Letterhead MakerPrintable letterhead with your name, contacts and accent colour.Place Card MakerPrintable folded place cards from a list of guest names.Bookmark MakerPrintable bookmarks with quotes, names and colour themes.Envelope PrinterPrint addresses on DL, C5, C6, #10 and invitation envelopes.Greeting Card MakerPrintable quarter-fold greeting cards from one sheet.Banner MakerPrintable letter-per-page party banners and bunting.

Inspect

EXIF Viewer & RemoverSee the camera, date and GPS location hidden in a photo — and strip it out.Image Colour PickerClick any pixel of an image to get its hex code, plus a palette.Palette from ImageExtract the dominant colours of any picture as copyable hex codes.Color Blindness SimulatorSee any image as protanopia, deuteranopia or tritanopia sees it.DPI CalculatorPixels, print size, DPI — enter two, get the third with a verdict.Image HistogramSee a photo's tone distribution and catch clipped shadows or highlights.Image to Text (OCR)Extract text from a photo, screenshot or scan — OCR on your device in 17 languages.QR Code ScannerDecode a QR code from a photo, screenshot or your camera — links shown, never auto-opened.Barcode ScannerRead EAN, UPC, ISBN, Code 128, QR and more from a photo or your camera — on device.Screen Colour PickerPick any colour on your screen with the eyedropper; HEX, RGB, HSL, OKLCH.Audio SpectrogramSee an audio file's frequencies over time and save the spectrogram as PNG.Loudness Meter (LUFS)Measure a file's LUFS, loudness range and true peak.

Tests

31 toolsView all →

Check your keyboard, mouse, mic, webcam and screen.

Input devices

Keyboard TesterPress every key and watch it light up — find dead or sticky keys.Mouse TesterCheck every button, double-click speed and the scroll wheel.Gamepad TesterSee every button, trigger and stick of a connected controller live.Click Speed TestHow many clicks in 10 seconds? Measure your CPS.Spacebar CounterHow many times can you press space? Timed challenges and saved bests.Typing Speed TestFlowing text, live WPM, and a progress chart of your runs.Touchscreen TestFind dead zones, count simultaneous touches and check full screen coverage.Vibration TestCheck if your phone can vibrate from the browser and play vibration patterns.CompassPhone compass with heading, direction and bearing lock, from your sensors.Spirit LevelPhone bubble level and inclinometer with calibration and slope percent.

Reflexes & memory

Reaction Time TestWait for green, click fast. Average of five rounds in milliseconds.Aim TrainerHit 30 targets fast. Average time and accuracy scored.Number Memory TestHow many digits can you hold in your head?Sequence Memory TestRepeat the pattern as it grows, Simon-style.Visual Memory TestMemorise the lit tiles, then click them from memory.Mental Maths Trainer60-second arithmetic sprints at four levels with speed and accuracy.Stroop TestName the ink colour, not the word, and measure your Stroop effect.

Screen

What Is My Screen ResolutionSee your screen resolution, viewport size and pixel density.Dead Pixel TestCycle full-screen colours to spot dead or stuck pixels.Refresh Rate TestMeasure your screen's real refresh rate in Hz.Eye TestScreen-calibrated Snellen letter chart for a quick at-home vision check.Colour Blindness TestQuick Ishihara-style dot-plate screening for red-green and blue-yellow.Colour Hue TestArrange shuffled colour chips into hue order and score your colour vision.Monitor TestGradient, black level, gamma, sharpness, uniformity and refresh-rate tests.

Audio & camera

Microphone TestCheck your mic is working with a live level meter.Speaker TestTest left and right channels, and sweep the full frequency range.Tone GeneratorPlay any frequency from 20 Hz to 20 kHz — sine, square, triangle, saw.Guitar TunerTune by microphone — a cents needle and standard tuning targets.Webcam TestPreview your camera and check its resolution and frame rate.Hearing Range TestFind the highest frequency you can hear. Not a medical test.Sound MeterApproximate decibel meter from your microphone, with min, average and max.

From the guides

All 147 guides →

How QR codes actually workWhat the squares in a QR code mean, how they survive damage, and the four reasons a QR code fails to scan. Written by someone who built an encoder.How long should a password be?Length beats complexity, and by a wider margin than most advice admits. What the maths actually says, and what to do instead of changing passwords monthly.Why Easter is on a different date every yearEaster is set by a formula involving the Moon, an equinox that isn't the equinox, and a 19-year cycle. Here's the computus, explained plainly.How to cite a website in APA and MLAThe exact format for citing a website in APA 7 and MLA 9 — with examples, the no-author and no-date fixes, and the mistakes graders actually flag.What DPI you actually need for printingWhy 300 DPI is the print standard, when 150 is fine, and how to check if your photo has enough pixels — with the arithmetic made visible.How to count macros, in plain EnglishWhat macros are, the 4/4/9 calorie rule, how to turn percentages into grams, and a worked 2,000-calorie example — without the influencer fog.

Why everything here is client-side

Every tool here runs inside your browser. Text you paste into the word counter, passwords you generate, files you hash — all of it is processed in the page and never sent anywhere, and there is no account and no upload step. The site is paid for by advertising, so Google's ad script does load on these pages, and Google Analytics counts which pages get opened. Both set cookies, as on any ad-supported site. Neither has any access to what you type into the tools. Full detail is in the privacy policy.