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PDF to JPG ConverterRender selected PDF pages to ordered imagesGrade CalculatorPoints or weights to a letter gradeSpin the WheelDrawn before it spins, and it says soDays UntilCountdown to any date, holidays by rule2048 GameOriginal tile-merging puzzle with local scoresGPA CalculatorWeighted or not, on the scale you nameAge CalculatorExact age, and when the next birthday landsTyping TestNet and gross WPM, counted properly
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Specialist 129 tools
Everyday, by topic 631 tools
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3D and CAD6 tools
STL ViewerOpen and inspect any STL in the browser3MF to STLConvert 3MF so older slicers can open itDXF ViewerOpen a DXF drawing in the browser, layers includedGLB and glTF ViewerInspect GLB and glTF scenes in the browserSVG to STLExtrude SVG shapes with their holesG-code ViewerStep through G-code toolpaths by layer
Markdown3 tools
Developer and data86 tools
JSON DiffCompare two documents structurallyXML FormatterIndent and check in the same momentSubnet CalculatorCIDR, masks, host ranges and splittingBase64 Encoder & DecoderEncode or decode, the direction is detectedUUID Generatorv4 and time-ordered v7, plus an inspectorSQL FormatterOne clause per line, subqueries nestedJSONL ViewerInspect newline-delimited JSON recordsJSON FormatterFormat and validate, with errors that name the causeLuhn Algorithm CheckerCheck digits without sending them anywhereIBAN ValidatorCheck a bank number's country, length and checksumJWT DecoderRead a token's claims and expiry, never transmittedMAC Address LookupVendor from the first three bytes, offlineNumber Base ConverterAny base from 2 to 36, exact at any sizeJSON to JSON SchemaInfer a draft 2020-12 schema from a sampleMeta Tag GeneratorTitle, description and social tags, ready to pasteUser Agent ParserBrowser, engine, OS and device from a UA stringFavicon GeneratorEvery size, and a real .ico fileRAID CalculatorUsable capacity for every RAID levelIP Address LookupWhich network an IP belongs to, datedList CompareCompare two lists line by lineHTML ViewerSee pasted HTML rendered with its sourceUTM BuilderCampaign links that keep their queryCSS Grid GeneratorBuild a grid, copy the CSS and the HTMLSVG ViewerSee any SVG rendered, measured and safeText to HexText to UTF-8 hex and back, byte for byteRedirect CheckerFollow a URL's redirect chain, hop by hopHTML FormatterIndent or minify, with the tags left aloneJSON to CSVObjects to a table, nesting and columns yoursHash IdentifierEvery format that fits, with the reasonASN LookupFrom an address to its AS number, and backHTML Table GeneratorFill a grid, copy escaped table markupMotorcycle VIN DecoderDecode a motorcycle VIN from the NHTSA recordHTML ValidatorLint HTML against a rule list you can readCSS Gradient GeneratorBuild a gradient, copy the exact CSSRegex TesterTest a pattern and see every match and groupCertificate DecoderRead a PEM certificate: names, dates, SANJSON String Escape and UnescapeOne literal in or out, quotes your choiceHTML Entity ConverterDecode HTML entities, or write themMarkdown Table GeneratorBuild a GFM pipe table, pipes escapedHTML to MarkdownPaste HTML, get GFM, with the drops listedCron Expression GeneratorFive fields, the sentence, the next ten runsRobots.txt TesterWhich rule wins for one URL, and whySQLite ViewerOpen a .db file: tables, rows and SELECTJSON Schema ValidatorDraft 2020-12, with the path of every failureJavaScript BeautifierRe-indent without rewriting a tokenHTML to TextStrip the tags, keep the wordsSchema Markup GeneratorJSON-LD for four types, escaped to pasteDomain ExtractorPull registrable domains out of pasted textXML to CSVPick the rows, pick the columns, get a CSVYAML ValidatorValidate YAML with the line and column namedText to HTMLEscape text into p, br or li markupJavaScript MinifierShrink JavaScript, checked token by tokenCSS Unit Converterpx, rem and em against the sizes you setParquet ViewerOpen a .parquet file: schema, rows, exportJavaScript ValidatorDoes it parse, and where does it stopLaTeX Table GeneratorEscaped tabular source from a grid or TSVRegex GeneratorBuild a pattern from examples and test itYAML to JSONConvert both ways, and yes stays a stringChmod CalculatorConvert Unix permissions between toggles, octal and symbolic stringsMAC Address GeneratorGenerate unique local-unicast MAC fixtures in four formatsRandom IP GeneratorGenerate reproducible IPv4 and IPv6 fixtures within declared rangesBulk URL OpenerReview, deduplicate and open links in explicit batchesPython PlaygroundRun Python 3.14 in your browser, with stdinJavaScript PlaygroundRun plain JavaScript in your browser, with stdinSQLite PlaygroundRun SQLite in your browser: joins, transactionsCSR DecoderRead a CSR: subject, key, SANs, signatureZIP Extractor and CreatorUnzip, zip and merge, unsafe paths caughtHex EditorEdit any file's bytes in hex, with undoKML, GPX and GeoJSON ViewerDraw and convert KML, GPX and GeoJSONXML Schema GeneratorDraft an XSD 1.0 schema from one XML sampleBcrypt GeneratorHash and verify bcrypt, 72-byte cut flaggedBatch File RenamerPreview new names, then zip the renamed copiesCurl to Code ConverterTurn curl into Fetch, Axios or Python, never runCSV to vCard ConverterContacts CSV to vCard, leading zeros keptPython FormatterRuff's own formatter, with a unified diffCSP InspectorSee which CSP directives actually applyHAR File AnalyzerInspect network logs and redact exportsSSL CheckerInspect a hostname’s TLS certificateEmail Header AnalyzerTrace declared hops and signed delaysBoolean SAT SolverSolve CNF with verified Boolean witnessesMermaid EditorRender Mermaid code to a sanitized SVG or PNGCSS Minifier and FormatterMinify or format CSS, checked against the inputJSON to Dart and TypeScriptDart classes and TypeScript types from JSONSAML DecoderRead a SAML request or response, layer by layerNBT EditorEdit binary NBT with exact 64-bit longsHTML to JSXPaste HTML, get JSX with every change listed
Work and study21 tools
Attendance Calculator and PlannerTrack courses and plan toward a targetCitation GeneratorAPA, Harvard and Vancouver from your metadataGPA CalculatorWeighted or not, on the scale you nameFuel Cost CalculatorA trip's fuel, in any units you haveTeleprompterFull screen, mirrored, paced in linesOnline NotepadNotes that survive a closed tabHours CalculatorAdd a week of shifts, hours onlyInvoice GeneratorFill it in, print it, cents that add upMeeting Time Zone PlannerA slot that works in every cityTime CalculatorAdd and subtract times as you type themWorld ClockAny city, to the second, DST includedMultiplication TableAny size, lit as you move, prints cleanChart MakerPaste two columns, download PNG or SVGResume BuilderNo account, no watermark, the file is yoursGrade CalculatorPoints or weights to a letter gradePay Raise CalculatorA raise in both directions, grossAnnual Wage CalculatorGross pay across every periodPomodoro TimerFocus sessions with breaks, on the clockWork Experience LedgerMap dated roles and count experience without double-counting overlapsCommission CalculatorFlat or tiered commission, every line shownSpreadsheet EditorEdit cells and formulas, sort rows, get CSV
Hardware checks13 tools
Mouse TestButtons, wheel, double-click and rateScreen SizeScreen, viewport and pixel ratio at onceKeyboard TesterPress a key and watch it registerCPS TestClicks per second, one to a hundredDead Pixel TestPure full-screen fills, one at a timeMic TestSee the level, then hear it backTone GeneratorAny frequency, four waves, volume guardedWebcam TestSee your camera and what it deliversVirtual PianoPlay piano with your computer keyboardArabic KeyboardType Arabic letters and copy them outReaction Time TestFive trials, median not just your bestOnline RulerA screen ruler that is actually to scaleGamepad TesterTest a controller in the browser
Everyday631 tools
Text and writing 57
Token CounterEstimate the token cost for Claude, GPT and LlamaCase ConverterTwelve cases at onceSlug GeneratorClean URL slugs from any titleLorem Ipsum GeneratorPlaceholder text that actually variesNumber to WordsSpell out figures for cheques and textWords to NumberTurn spelled-out numbers into digitsReverse TextReverse letters, words or lines, emoji intactTyping TestNet and gross WPM, counted properlyReading Time CalculatorMinutes to read, and minutes to sayCursive Signature GeneratorYour name in six scripts, or drawnZalgo Text GeneratorStack the marks, and take them offSyllable CounterCount English syllables line by lineCharacter CounterCounts, and what each platform allowsFancy Text GeneratorUnicode styles, and which ones surviveWord Cloud GeneratorTurn text into a word cloud PNGAlphabetizerSort any list alphabeticallyText CompareCompare two texts line by lineASCII Art GeneratorTurn an image into monospace charactersText RepeaterRepeat any text, with no trailing separatorComma SeparatorJoin a list into one line, or valid CSVPhone Number FormatterFour formats at once, up to a thousand linesIncorrect Quotes GeneratorYour characters, 160 original exchangesReading Level CheckerFour readability scores, with the workingText to CSVDelimited or fixed width text into real CSVKeyword Density CheckerWord and phrase counts, with the denominatorPhone Number ExtractorPull phone numbers out of pasted textWriting Prompt GeneratorStory prompts by genre, tone and constraintText CleanerClean pasted text, one visible step at a timeRandom Sentence GeneratorPractice sentences in any tense, from a seedText SplitterCut text into chunks that join back exactlyRandom Paragraph GeneratorWhole paragraphs at the length you ask forWords to Pages CalculatorPages from a word count, assumption shownAcrostic Poem GeneratorOne line per letter, every line yours to editSequence Reverse ComplementReverse and complement DNA or RNA text and FASTA recordsBurrows–Wheeler TransformTransform and invert text with sorted rotations and a primary indexPalindrome CheckerCheck grapheme palindromes with explicit filters and mismatch positionsHandwriting Worksheet MakerPrint and cursive tracing sheets from your wordsFont MakerDraw your own letters, export an OTF fontLiteracy Worksheet MakerSeven activities from your words, key includedSpecial CharactersSearch Unicode names and copy any symbolEML Viewer and EML to PDFOpen an .eml and print it, trackers blockedCurved Text GeneratorText around a circle, as SVG or PNGEPUB ReaderRead an EPUB in the browser, scripts blockedSpelling PracticeHear each word, type it, review your missesDOCX ViewerRead a .docx with outline, search and printText to EmojiSwap words for emoji, and undo any oneIPA TranscriberEnglish to IPA, every dictionary variant shownScreenplay FormatterTyped script blocks to a paged Courier PDFElder Futhark Rune TransliteratorLatin letters to Elder Futhark runes, map shownRuler Reading PracticeRuler reading quiz, down to 1/16 in or 1 mmNumber Line GeneratorExact fraction ticks, pins and jumps, printableGreek Alphabet PracticeGreek letters, recall and same-test challengesShipping Label MakerAddress labels with CSV batchesRubric MakerWrite criteria, describe levels, print a rubric.Armenian KeyboardType Armenian with clear Unicode key mapsVietnamese TypingTELEX, accented keys and Unicode exportRhyme FinderRhymes by sound, every pronunciation shown
Images and colour 104
Barcode GeneratorReal Code 128 and EAN-13, download as PNGJFIF to JPG ConverterTurn JFIF into a standard JPG locallyMeme GeneratorCaption your own image, locallyImage Color PickerHex codes from any image, never uploadedHex to RGB ConverterHex, RGB, HSL and names, plus contrastColor Contrast CheckerText and background contrast, checkedColor Palette GeneratorOne colour into five, with contrast ratiosSpeech Bubble PNGMake a transparent speech bubble PNGCollage MakerMake a photo collage, nothing uploadedImage ResizerResize to exact pixels without uploadingImage CompressorCompress to a target size, not a guessImage InverterInvert colours and keep transparencyImage to PDFImages into one PDF, shape keptGIF CompressorShrink an animated GIF in your browserQR Code ReaderRead a QR code from an image or cameraImage CropperCrop a picture to exact pixelsAVIF to PNGConvert AVIF pictures to PNG or JPEGSVG to PNGRasterise an SVG at any sizePixelate ImagePixelate a selected areaGIF ResizerResize an animated GIFImage SplitterCut an image into numbered tilesImage SharpenSharpen a photo without halosImage FlipperFlip and rotate an imageImage OverlayLayer two pictures, nothing uploadedPDF CropperCrop PDF pages without uploadingGIF ReverserPlay an animated GIF backwardsImage BlurBlur a whole picture or one dragged boxImage Metadata ViewerSee the EXIF a photo carries, GPS includedImage WatermarkWatermark photos in batches, nothing uploadedNormal Map GeneratorHeight map to a tangent-space normal mapGIF to Sprite SheetPack every GIF frame onto one sheetColor Blindness SimulatorDeuteranopia, protanopia and tritanopiaGIF Speed ChangerSpeed a GIF up or slow it downEXIF RemoverStrip metadata without touching the pixelsTIFF to JPGConvert TIFF pages to JPEG or PNGImage DPI ChangerSet the stored print resolution, not the pixelsGIF Frame ExtractorSave every GIF frame as a PNGWiFi QR Code GeneratorA QR code that joins your networkPixels to Print SizePixels to inches at the DPI you setColor Name FinderThe nearest CSS colour name, and how closePPI CalculatorPixel density from resolution and diagonalJPEG to BMPWrite a real 24-bit uncompressed BMPPixel CounterCount pixels, opaque ones and colour matchesUPC Check Digit CalculatorThe check digit, with every weight shownRGB to CMYKThe algebra both ways, no ICC profilePDF MergerMerge, split, rotate and reorder PDF pages locallyFlag MakerDesign layered flags with local artwork and SVG, PNG and project exportsVideo CompressorShrink a video to a target size, no uploadImage to WordPrinted text from an image into WordPDF CompressorShrink a PDF toward a target, see real bytesBarcode ScannerRead barcodes from a photo or camera, as textBulk QR Code GeneratorUp to 500 QR codes from a CSV, each checkedData Matrix GeneratorECC200 from text or hex bytes, SVG or PNGDrawing AppPaint on layers, nothing uploadedOrganization Badge MakerID badges from a CSV, backs lined upIPYNB to PDFPrint a Jupyter notebook to PDF, nothing runSearchable PDF OCRScanned PDF to searchable PDF and textDocument ScannerStraighten page photos by their four cornersWebP to GIFTurn an animated WebP into a GIFVideo Frame ExtractorSave video frames with their real timestampsVideo CropperCrop a video to any box or ratio, no uploadPanorama ViewerLook around a 360 photo in your browserVideo ConverterWebM to MP4, MP4 to WebM or GIF to videoSquare Avatar MakerBuild a pixel face from original partsCoat of Arms MakerAn original shield, layer by layerPoster MakerPosters, flyers and banners, layer by layerNewspaper GeneratorYour own front page, as a PDF or PNGPDF HighlighterHighlight PDF text and add notes locallyVideo ReverserPlay a video backwards, no uploadFantasy Map GeneratorSeeded lands, towns, hexes and dungeonsStencil MakerPicture to stencil, loose pieces flaggedPSD Viewer and PSD to JPGOpen a PSD, list its layers, save a JPGPDF FlattenerFlatten PDF form fields or pages to imagesSprite Sheet MakerPack images into an atlas with a JSON frame mapVideo JoinerJoin and trim video clips, no uploadPDF Table ExtractorDraw column guides, get the PDF table as CSVGreen Screen RemoverKey out a backdrop color to a transparent PNGSubtitle EditorEdit SRT and VTT cues against your own videoCBZ to PDFTurn a comic archive into one ordered PDFPhoto Date StamperStamp dates on photos, from EXIF or typedTrading Card MakerOriginal cards with your art, stats and backsInstant Photo Frame MakerInstant-photo frames and strips, print-readyImage to SketchPhoto to pencil or edge sketch, nothing uploadedPDF N-up and Booklet ImpositionPDF pages n-up, or as a fold-in-half bookletImage Color ReplacerSwap one color for another, shading keptPDF Page OrganizerRemove blank pages, reorder and rotate a PDFPDF Metadata RemoverInspect, remove, then verify PDF metadataComic Strip MakerYour panels, artwork and speech bubbles.PDF to GrayscaleGrayscale PDF with page previewsContact Sheet MakerPhoto proof sheets in name order, PDF or PNGSeamless Texture MakerBlend borders and preview a repeating tile.Cursor MakerDraw pixels, set a hotspot, save a cursor.Animated Text GeneratorAnimate your words with editable keyframes.Fractal GeneratorCreate seeded trees and rule-based fractals.Perspective Grid MakerOne, two and three point drawing guidesDDS to PNG ConverterConvert DXT1, DXT3 and DXT5 textures to PNGPDF Image ExtractorPull the stored images out of a PDFStereogram DecoderShift a stereogram to find its hidden shapePaper Snowflake MakerCut a folded wedge, see the whole snowflakeLow Poly Art MakerTurn a photo into editable low-poly trianglesFluid Dye PlaygroundPaint dye and push it through a fluidPDF Word CounterWords per PDF page, scanned pages flaggedDroste Effect MakerNest a picture inside itself, nothing uploadedSprite Animation StudioAnimate pixel art frame by frame, export a GIF
Math and algebra 67
Percentage CalculatorFive questions, each showing its workingMidpoint CalculatorThe point halfway between two coordinatesRatio CalculatorSolve, simplify and scale ratiosRounding CalculatorRound to places, significant figures or a multipleScientific Notation ConverterDecimal to scientific and engineering notationMatrix CalculatorInverse and determinant, in fractionsFraction CalculatorExact fractions, mixed numbers and decimalsSignificant Figures CalculatorCount, round and operate with sig figsGreatest Common Factor SolverGreatest common factor, with the stepsPrime Factorization CalculatorPrime factors, exponents and a treePrime Number CheckerCheck whether a number is primeQuadratic Formula CalculatorRoots, discriminant and the worked stepsLogic Gate SimulatorWire gates, flip switches, watch the outputIntegral CalculatorAntiderivatives and definite integralsRadical SimplifierSquare roots in simplest form, with stepsSummation CalculatorSigma sums, exact for integer termsLinear Interpolation CalculatorThe y between two points, or beyond themBinary CalculatorBinary maths with carries and overflow shownLong Multiplication CalculatorThe column method, carries and point placedSynthetic Division CalculatorDivide by x minus r and see every rowSystem of Equations CalculatorTwo to six unknowns, solved in fractionsKarnaugh Map SolverMinterms to a minimal sum of productsModulo CalculatorRemainder and Euclidean modulo, side by sideComplex Number CalculatorArithmetic on a + bi, polar form beside itTruth Table GeneratorEvery row, with satisfiability and tautologyLong Subtraction CalculatorEvery borrow drawn where it happenedLimit CalculatorBoth one-sided limits beside the answerPartial Derivative CalculatorEach partial checked against a measured slopePolynomial Division CalculatorLong division with every step, kept exactExponential Growth CalculatorPer period or continuous, and it says whichUnit Rate CalculatorPer-unit rates, and two offers comparedDivisibility CalculatorYes or no, with the digit rule worked outCubic Equation SolverAll three roots, each checked by substitutionBoolean Algebra CalculatorSimplify, and prove it against the truth tableAverage Rate of Change CalculatorThe secant slope, with the derivative beside itPolynomial Multiplication CalculatorMultiply out term by term, kept exactVector Products CalculatorCross and dot, every determinant term shownEigenvalue CalculatorEigenvalues and vectors, each one checkedLaplace Transform CalculatorTransform f(t) or invert F(s), rule by rulePolynomial Factoring CalculatorExact factors over the rationals, checkedPartial Fraction CalculatorExact partial fractions, added back as a checkBinomial Expansion CalculatorExpand (ax + b)^n, or just one termDimensional Weight WorksheetCompare package weights with exact unit conversion and explicit roundingBicycle Gear CalculatorCompare all gear ratios, rollout and cadence-derived speedsGolden Ratio Design ToolCalculate golden sections and export labeled rectangle constructionsTablecloth Size CalculatorCompare tablecloth dimensions for your table shape and chosen dropsSwim Pace CalculatorCalculate swim pace, pool lengths and complete split tablesYarn Length CalculatorEstimate remaining yarn length from net mass and a known skeinReading Session CalculatorCalculate reading-session WCPM, accuracy and local historyGrading Curve CalculatorApply chosen score transformations and compare before/after distributionsFrequency Table MakerCount categories or numeric bins with explicit frequency denominatorsTriathlon Time PlannerCompare swim, bike, run and transition time scenariosIEEE 754 ConverterInspect exact binary32/binary64 bits, rounding and adjacent valuesSorting Algorithm VisualizerCompare sorting traces, exact operation counts and equal-key stabilityMath Practice QuizQuiz yourself on math, with the working shownMath Worksheet MakerArithmetic sheets from your ranges, key includedExpression SimplifierSimplify algebra, keep its domainTukey Comparison CalculatorEvery pair of means, with intervals.Multiplication PracticePractise facts, review misses, share a testSignificant Figures PracticePractice precision with marked numeric quizzesLogarithm and Power WorkbenchLink logarithms, powers and inverse checksAlgebra TilesArrange signed tiles and model equationsLaTeX Equation EditorType LaTeX, see the formula, save SVG or PNGFraction Strip WorkbenchDrag fraction bars, read exact sums and matchesAlgebra Constraint SolverExact sign charts and interval answersDifference Quotient CalculatorSubstitute, cancel, divide by h, all exactAsymptote CalculatorHoles and poles told apart by exact cancelling
Home, garden and craft 41
Grams to Cups ConverterBy ingredient, because density decidesSquare Footage CalculatorRooms added up, feet and inches as typedConcrete Slab CalculatorSlab dimensions to cubic yards and bagsPaint CalculatorWall area and coats to litres or gallonsGravel CalculatorGravel volume, tons and bags for an areaMulch CalculatorMulch volume, yards and bags for a bedSoil CalculatorSoil volume and bags for beds and potsAsphalt CalculatorAsphalt volume and tonnage from measurementsBoard Foot CalculatorBoard feet for a whole lumber orderTile CalculatorTiles and boxes for a floor or wallSod CalculatorRolls and pallets for a lawnPaver CalculatorPavers and packs for any patioFence CalculatorPanels, posts and pickets for a fence runDeck Board CalculatorRows, boards and the rip on the last rowPlywood CalculatorSheets for an area or a cut listQuilt Backing CalculatorBacking yardage, seam losses countedCarpet CalculatorRoll runs, seams and waste for a roomCircle Skirt CalculatorWaist radius, hem and fabric for a circle skirtQuilt Binding CalculatorStrips and yardage, with the joins countedFlooring CalculatorBoxes of flooring for one room or severalWallpaper CalculatorDrops, cut length and whole rolls to buyCandle Wax CalculatorWax and fragrance for a batch, basis statedPlant Spacing CalculatorPlants that fit a bed at your spacingGift Wrapping Paper CalculatorThe sheet a box needs, both ways roundBrick CalculatorBricks for a wall, joint and openings countedResin CalculatorMould volume, then the ratio on your bottleRainwater Harvesting CalculatorWhat one rainfall puts in the tankCross Stitch Fabric CalculatorStitched size and the piece to cut, any countFirewood CalculatorStacked wood in full cords and face cordsPool Fill Time CalculatorFill time from a flow you measuredCoffee Ratio CalculatorCoffee and water by weight, at your ratioCross Stitch Pattern MakerChart a photo or grid, every stitch countedPacking Checklist PlannerPack by traveler and bag, with bag weightsLithophane MakerPicture to lithophane STL, backlit previewPizza Dough CalculatorScale dough and print your ingredient sheetString Art Pattern MakerTurn a photo into numbered thread pathsFabric Cutting PlannerPlan rectangular cuts, grain and wasteGarden Layout PlannerArrange a measured garden planCrochet Chart MakerMake filet and C2C symbol charts.Taco Bar CalculatorGuest portions to a taco-bar shopping listTilemap EditorPaint game levels from your own tileset
Random picks 29
Random Number GeneratorSecure draws, no repeats, and diceRandom Phone Number GeneratorReserved test numbers that never reach a real phoneDice RollerEvery die drawn, with advantage and dropsRandom Team GeneratorSplit a list into teams, evenlyRandom Name PickerDraw one name, with a revealSpin the WheelDrawn before it spins, and it says soYes or NoOne fair draw, with the tally keptMagic 8 BallTwenty answers in their real proportionsCoin Flip SimulatorFlip one coin or a hundred, fairlyPassword GeneratorRandom passwords and passphrasesList RandomizerShuffle a list with a fair random drawRandom Letter GeneratorDraw random letters, with or without repeatsRandom Animal GeneratorRandom animals, filtered by groupRandom Email GeneratorTest addresses on reserved domainsRandom Object GeneratorEveryday objects to draw, tagged and filteredRandom Country GeneratorA country at random, list shownRandom String GeneratorUnbiased random strings, drawn in your tabRandom Date GeneratorRandom dates in a range, weekday filterRandom Food GeneratorDishes, drinks and fruit, drawn at randomRandom Emoji GeneratorDraw random emoji with their Unicode namesRandom Question GeneratorConversation questions by theme and depthRandom State GeneratorA fair draw from the 50 US statesRandom Noun Generator412 tagged nouns, plurals includedRandom Shape GeneratorSeeded closed shapes, download SVG or PNGRandom Adjective Generator420 tagged adjectives, a phrase for eachRandom Topic GeneratorDiscussion topics by category and audienceRandom Job Generator268 job titles, each with what it doesSuperpower GeneratorPowers with the limit that makes them a storyFortune Cookie GeneratorWritten fortunes, printable eight to a page
Statistics and probability 34
Average CalculatorMean, median, mode and range from a listDot Plot MakerOne dot per value, outliers keptHistogram MakerBins, counts and the edge rule statedStem and Leaf Plot MakerEvery value placed, and the key statedNormal Probability PlotQ-Q plot with the convention statedZ-Score Calculatorz, both tails and the percentile at onceMean Absolute Deviation CalculatorMean and median absolute deviation, kept apartLinear Regression CalculatorLeast squares fit, residuals and R-squaredBinomial Distribution CalculatorExact count, both tails, mean and varianceHypergeometric Distribution CalculatorP(X = k), both tails and the supportCoefficient of Variation CalculatorSpread as a percent of the mean, basis namedNormal Distribution CalculatorAreas under a normal curve, both directionsQuartile CalculatorQ1, Q3 and the IQR, with the method namedExpected Value CalculatorMean, variance and SD from a distributionPoisson Distribution CalculatorPoint, cumulative and tail for one rateFisher Exact Test CalculatorExact 2x2 p, both tails and the odds ratioConfidence Interval CalculatorAn interval for a mean, with t or zQuadratic Regression CalculatorLeast squares parabola, residuals and R²Permutation CalculatorCount ordered arrangements, exactlyEffect Size CalculatorCohen d and Hedges g, with the pooled SDChi-Square Test CalculatorStatistic, df and p, with every expected cellOne-Way ANOVA CalculatorEvery sum of squares, with F, df and pCritical Value Calculatorz, t, chi-square and F, one tail or twoT Distribution CalculatorLower, upper and two-sided, and back againDice Probability ExplorerExplore exact dice sums, highest and lowest roll probabilitiesTurnover Rate CalculatorCompare descriptive period turnover with explicit headcount denominatorsSample Size CalculatorSurvey responses for a margin, working shownBeta and Lognormal Distribution LabBeta and lognormal: density, quantiles, drawsBland–Altman PlotPlot paired differences and reference linesCronbach Alpha CalculatorInspect scale consistency and item diagnosticsClustering LabSeeded clusters with complete tracesRank Test CalculatorInspect paired and independent rank tests.T-Test CalculatorPaired, Welch or one-sample t from raw dataLevene Test CalculatorLevene or Brown-Forsythe from raw groups
Time and date 25
Duration CalculatorHow long lies between two momentsEpoch ConverterUnix timestamps to dates and backAge CalculatorExact age, and when the next birthday landsAge Gap CalculatorThe exact gap between two birth datesBusiness Days CalculatorWorking days between dates, weekends skippedMilitary Time Converter24-hour to 12-hour, and how it is saidOnline StopwatchStays right when the tab is hiddenWeek NumberISO and US week numbers, side by sideDate CalculatorAdd days, weeks or months, month rule statedMoon PhaseTonight's phase, drawn to its illuminationDays UntilCountdown to any date, holidays by ruleJulian Date ConverterOrdinal date and Julian Day Number, both waysOnline Alarm ClockSet an alarm that rings in your browserClassroom TimerRoom-sized countdown with lesson activitiesInterval TimerWork and rest rounds, counted from the clockDecimal ClockThe ten-hour day, live beside your clockCustom Calendar MakerA printable month with only your eventsBinary ClockThe time in binary or BCD, every bit labelledTimecode CalculatorAdd and subtract timecode, drop-frame countedMultiple TimersRun independent countdown groups with recovery, laps and completion historyExam TimerExam phases with end times, projectedTeaching ClockMove the hands and practise reading timeRevision Timetable MakerFit study tasks around your weekGantt Chart MakerPlan tasks, dependencies and baseline dates.Work Schedule Maker for Repeating ShiftsYour shift rotation as a calendar and ICS file
Games and puzzles 105
Secret Santa GeneratorDraw a private gift exchange locally2048 GameOriginal tile-merging puzzle with local scoresSudoku OnlineOriginal Sudoku with notes and honest hintsAnagram SolverEvery word your letters can makeSudoku SolverSolve a sudoku, or check your ownWordle SolverGreen, yellow and grey to the words leftSpelling Bee SolverEvery word from seven lettersBlock Circle GeneratorPlan a circle block by blockChess ClockA two-player chess clockCharades GeneratorCharades and drawing prompts by difficultyBingo Card GeneratorSeeded, printable, with a call listOnline ScoreboardA big scoreboard for any gameWord Search MakerSeeded grids, and no word dropped in silenceOnline Tally CounterCount with the space bar, and it remembersMaze GeneratorSeeded, printable, solution a click awayRound Robin GeneratorEvery team plays every team, by roundCrossword MakerInterlocking grids, and nothing droppedWord Ladder SolverShortest chain, one letter a stepNether Portal CalculatorOverworld and Nether coordinates at 8 to 1Nonogram SolverSolve a nonogram, or find both answersBoggle SolverEvery word your board spells, and whereImposter Word Game150 paired words, dealt round one phoneKill Death Ratio CalculatorK/D and KDA, each denominator namedTruth or Dare GeneratorAll-ages party prompts, and passing is freeDarts ScorekeeperScore darts visits, busts, legs and sets with undoGame of Life LabDraw and simulate Conway grids with RLE and project exportsBaseball ScoreboardTrack innings, runs, counts and runners with corrections and undoBingo CallerCall 75- or 90-ball bingo with pause, undo and a printable logInventory Stack CalculatorCount stacks, partial slots and shared containers for an item worksheetUS State Capitals QuizLearn 50 state capitals with a map, seeded quizzes and shared challengesBaseball Batting StatsCalculate batting average, OBP, slugging and OPS from game countsBowling Score CalculatorScore ten-pin rolls with pending bonuses and printable multiplayer cardsPasser Rating CalculatorCalculate NFL and NCAA ratings with exact formula components and game totalsNumber Recall GameRecall timed digit strings and share a reproducible ten-trial challengePoint Buy CalculatorAllocate six custom attributes using an editable point-cost tableCribbage Hand CalculatorScore cribbage combinations and keep an undoable local peg boardTower of HanoiSolve the three-peg puzzle, explore recursion and share move challengesOSRS XP CalculatorCompare standard OSRS XP goals using supplied time and action ratesYatzy Score SheetKeep multiplayer Yatzy scores with explicit rules, corrections and printGolf ScorecardRecord golf rounds, compare snapshots and print scorecardsColor CodebreakerCrack a hidden color code and share the same puzzleTable Tennis ScoreboardTrack table-tennis points, service order and deciding-game endsBadminton ScoreboardBadminton score with server and service courtSpider SolitaireOriginal Spider with 1, 2 or 4 suits and undoFalling Sand GamePour sand and water around walls you drawSeven-Letter Word GameDaily and unlimited seven-letter word puzzlesChess Puzzles5,000 Lichess tactics with hints and replayNonogramsOriginal picture puzzles, one solution eachPyramid SolitairePair cards to 13 and clear the pyramidGeography Quiz: Capitals and FlagsQuiz capitals and flags of 82 countriesLudoClassic Ludo for 2 to 4, with computer seatsBackgammonBeginner computer or a friend, legal moves shownHex Board Layout GeneratorSeeded 19-hex boards with rules you pickCube Practice TimerScrambles, inspection, ao5 and ao12 by sessionLetter Grid GameTimed word hunts on seeded letter gridsHidden Word Challenge MakerHide your own word and send it as a linkUltimate Tic-Tac-ToeNine boards in one, vs a computer or a friendCheckersCheckers for two or against the computerSoccer Lineup MakerYour players on a pitch, with bench and subsConnect Four AnalysisScore every column, marked exact or estimatedLogic Grid PuzzlesOriginal logic grid puzzles, one answer eachShikakuOriginal rectangle puzzles, solver-checkedVolleyball ScoreboardScore volleyball sets with serve and full undoMinesweeper SolverCertain moves first, then exact mine oddsSuguru PuzzlesOriginal region puzzles, one solution eachGo BoardGo for two, or a beginner computer on 9x9MancalaKalah vs a computer or a friend, with undoRace TimerTime laps and finishes from one common startNumbers Target GameTimed number targets with an exhaustive solverKiller SudokuOriginal cage-sum Sudoku, one solution eachSea BattleHunt a hidden fleet against a fair computerSliding Puzzle SolverSolve 8 and 15 puzzles, shortest where provenLights Out SolverThe presses that clear it, or proof none doInitiative TrackerTurn order, rounds and reversible encountersCrazy EightsPlay Crazy Eights with local computer opponentsCryptogram SolverFind clue-consistent substitution candidatesYukon SolitaireUnordered groups, four suit foundationsHangman GameGuess a word with six chances to missNurikabe PuzzlesNumbered islands and one connected seaHangman SolverMatch clues and compare next-letter choicesBinairo PuzzlesBalance binary grids and avoid triplesMemory Matching GameFind pairs in a seeded card layoutAnagram Word GameFind words in a seeded letter rackHitori PuzzlesShade numbered grids with three linked rulesSlitherlink PuzzlesConnect the clues into one closed loopNPC GeneratorCreate seeded fictional characters with notesChinese Checkers GamePreview each hop on a 121-hole starFill-in PuzzleFit every bank entry into an original gridKakuro PuzzlesMake both crossing sums agree without repeatsWord Chain Puzzle SolverWord chains that use all twelve lettersBall Sort PuzzlesSort colored balls until each tube is one colorWord Ladder GameClimb original ladders one letter at a timeBasketball Play CreatorDraw a play on a court, then watch it runSandwich SudokuSudoku plus sums between each 1 and 9Dots and BoxesClose boxes vs a friend or the computerFutoshiki PuzzlesOriginal inequality grids, one solution eachReversiFlip discs with a friend or the computerPentomino Puzzle SolverFind a pentomino tiling, or count every onePawn Path GamePawn race with walls, for two or vs the computerJigsaw Puzzle MakerCut your own picture into a playable jigsawCalcudoku PuzzlesArithmetic cage grids, one solution eachStar Battle PuzzlesPlace stars that never touch, one solution eachMouse Aim PracticeClick and track targets, see every missHashi PuzzlesIsland bridge puzzles, one solution eachFleet Logic PuzzlesFind a hidden fleet from row and column totals
Ciphers, codes and alphabets 34
Binary to TextBinary, octal and hex, both directionsRussian TransliterationTransliterate Russian characters reversiblyMorse Code TranslatorBoth directions, and it plays the soundRoman Numeral ConverterBoth ways, with the breakdownNATO Phonetic AlphabetSpell a code out loud without being misheardVigenère CipherVigenère, Caesar and Atbash, both waysEnglish to Greek TransliterationLatin letters to Greek and backSpanish AccentsClick to copy every Spanish accented letterWingdings TranslatorLetters to Wingdings symbols, both waysHebrew KeyboardType Hebrew without changing settingsURL Decoder and EncoderDecode and encode URLs and query valuesBraille TranslatorText to uncontracted Grade 1 brailleRussian KeyboardType Cyrillic, and four more scriptsGematria CalculatorLetter values and sums, with the table shownScytale Cipher Encoder and DecoderThe Spartan rod cipher, with its grid drawnLeetspeak TranslatorReadable or aggressive 1337, and backAtbash CipherA to Z mirrored, Latin or HebrewPlayfair Cipher Encoder and DecoderThe 5x5 keyed square, digraph by digraphWhatsApp Link GeneratorCompose contact links, HTML and downloadable QR codesMailto Link GeneratorCompose email links with recipients, subject and bodyISBN ConverterValidate and convert ISBN batches with per-row resultsIPA KeyboardType IPA symbols by click, name or X-SAMPAJapanese KeyboardType hiragana and katakana from romajiKorean KeyboardType Hangul on the two-set layoutAmharic KeyboardType Amharic by family, or with a key mapPunjabi KeyboardType Gurmukhi one code point per keyHiragana and Katakana QuizQuiz hiragana and katakana, row by rowAssamese KeyboardType Assamese by key or by phonetic spellingOgham Alphabet TransliteratorLatin letters to Ogham, with a stem diagramClassical Cipher WorkbenchCaesar to book cipher, every step shownCipher IdentifierWhich classical cipher fits, and whySinhala TypingType Sinhala by phonetic spelling or syllableBaybayin TransliteratorMap Tagalog spelling to Unicode BaybayinMorse Practice TrainerPractice Morse and compare seeded scores.
Music and audio 38
MetronomeBooked on the audio clock, so it holdsText to AudioYour own text read aloud, to the endGuitar TunerCents from the mic, tones for every stringGuitar Chord ChartChord shapes with notes and fingeringsAudio TrimmerTrim audio in your browserSpeaker TestTest left and right speakersWhite Noise GeneratorWhite, pink and brown, made as it playsAudio ConverterConvert to WAV or MP3 without uploadingAudio SplitterCut one recording into many WAV partsAudio JoinerJoin audio files, nothing uploadedBPM detectorRead a track's tempo, octaves and allChord TransposerWhole sheets, with the columns keptAudio Speed ChangerPlay audio faster or slower, pitch keptScale FinderEvery scale your notes fit, and its tonicChord Progression GeneratorDiatonic progressions you can find againPiano Chord FinderPress keys, read every name the chord hasMandolin Chord ChartEvery shape a chord has in GDAE tuningAudio RecorderRecord, pause and trim microphone audio with local WAV exportVoice Effects StudioRobot, radio and wobble effects you can editVocal Range TestHold your lowest and highest, see the spanVirtual DrumsPlay nine pads, loop the beat, save a WAVClassroom Noise MeterRoom noise in bands against a quiet baselineSheet Music MakerNotes to a staff, with every bar checkedVirtual GuitarPluck, strum and record a six-string guitarAudio to TextSpeech to editable text, nothing uploadedViolin Finger ChartFirst-position notes, fingers and tonesEar Training StudioName notes, intervals and chords by earGuitar Tab MakerTab by string and fret, with playback and MIDIMP3 Tag EditorEdit MP3 tags without touching the audioAudio Silence RemoverReview quiet regions before cuttingSight Reading PracticeRead the staff, answer on piano or MIDIAudio Spectrum AnalyzerInspect local audio frequency contentMIDI WorkbenchEdit MIDI notes, play and exportVirtual SynthesizerTwo oscillators, filter and LFO, played liveRhythm TrainerTap seeded rhythms, see every note's errorMelody Sketch GeneratorRule-based melodies to edit and save as MIDIAudio ReverbReverb with the whole tail in the WAVSpeech JammerYour voice, a beat late, in your headphones
Money and business 18
APY & Interest CalculatorAPY from rate and compounding, with the working shownCD CalculatorWhat a certificate earns by maturityCapital Adequacy Ratio CalculatorTier 1 and 2 capital over risk-weighted assetsROI CalculatorReturn on investment, total and yearlyRent Split CalculatorEven, by room size or by income, to the centMarkup CalculatorMarkup and margin, never mixed upCPM CalculatorAny two of spend, impressions and CPMBill Split CalculatorSplit a receipt item by item, tax includedSafety Stock CalculatorSafety stock and reorder point, formula shownCurrency ConverterConvert at the ECB's dated reference rateLead Time CalculatorStages added up, in working days, to a dateGross Profit CalculatorRevenue minus COGS, with margin and markupCTR CalculatorAny two of clicks, impressions and rateROAS CalculatorRevenue over ad spend, and the break-evenCPC CalculatorPrice of a click from any two figuresConversion Rate CalculatorConversions over any denominator you nameCash Count WorksheetCount editable denominations with exact totals and printable worksheets3D Print Cost CalculatorFilament and power cost, worked line by line
Units, physics and reference 31
Unit ConverterTen categories, every unit at oncePaper SizesA4, Letter and Legal, drawn to scaleTire Size CalculatorRead a sidewall code and compare two sizesFeet and Inches CalculatorAdd and subtract feet and inchesEngine Displacement CalculatorSwept volume from bore, stroke and cylindersLatitude Longitude ConverterAll three notations at once, both waysPlayback Speed CalculatorTime at 1.5x, or the speed a deadline needsData Transfer CalculatorHow long a file takes at a given link speedMomentum CalculatorMomentum and impulse, with the sign keptPotential Energy CalculatorGravitational mgh or spring energy, in joulesEarth Curvature CalculatorHow far the horizon is, and what it hidesAcceleration CalculatorSolve a, vf, vi or t, with the sign keptTime Dilation CalculatorGamma, and the two clocks it separatesAtom BuilderBuild atoms and ions particle by particleGravity SimulatorOrbit up to 50 bodies and watch energy driftPeriodic Table QuizQuiz element names, symbols and numbersEvent Probability CalculatorTwo-event union, intersection and conditionalsPunnett Square LabExact crosses and printable worksheetsAVL Tree VisualizerStep through AVL operations and rotationsSpectrum ExplorerLink wavelength, color and photon energyMandelbrot ExplorerExplore fractals and inspect complex orbitsLunar Phase ExplorerLink orbital angle to the illuminated diskParts of Speech PracticeName each highlighted word, then see whyWave Superposition LabAdd two traveling waves and watch the sumParticle Life SandboxSet who chases whom among up to 2,000 particlesPhylogenetic tree makerPaste Newick, reroot it, export SVG or PNGInverse Function CalculatorInvert f(x) exactly, with its domain and graphStrange Attractor LabTrace Lorenz and Rössler paths from two startsParabola Geometry ExplorerFocus, directrix and equation in exact formEuler's Method CalculatorEuler and RK4 steps over a slope fieldDomain and Range CalculatorExact domain and range in interval notation
Geometry and shapes 15
Aspect Ratio CalculatorResize without distortingArea CalculatorEvery shape, with the formula shownVolume CalculatorBoxes, tanks, pools and pipes in litresSlope CalculatorSlope, angle, grade and the roof pitchRight Triangle CalculatorTwo values in, the whole triangle outRadians to DegreesAngles both ways, π fractions keptOnline ProtractorMeasure any angle on a photo you drop inTriangle CalculatorThree parts in, both SSA answers outScale CalculatorModel to actual, with a unit on each sideCircumference CalculatorCircumference as a multiple of pi, and backDiagonal CalculatorCorner to corner, for a rectangle or a boxCurve Arc Length CalculatorCurve length, with the error estimatedUnit Circle CalculatorExact sin, cos and tan on the unit circleUnit Circle PracticeUnit circle game, every answer checked exactlyBézier Curve LabBuild Bézier curves and export the exact SVG path
Name generators 9
Username GeneratorHandles from your words, rules checkedFantasy Name GeneratorElf, orc, dragon and 28 more stylesBand Name GeneratorTen styles, and a seed that replays the listShip Name GeneratorTwo names blended, every piece labelledRapper Name GeneratorRap and stage aliases from your nicknameTeam Name GeneratorEight activities, four tones, your own seedSong Title GeneratorTitles built around a word you typePet Name GeneratorSix species, each with its own name listMovie Title GeneratorTen genres, your setting, a seed that replays
Health, sport and pets 10
Dog Age CalculatorReal dog years, banded by breed sizeBody Fat Percentage CalculatorNavy tape method and BMI method, side by sidePace CalculatorPace, time or distance, splits and the chartSmall Dog BreedsFilter small breeds by size and sheddingSteps to Miles CalculatorSteps to miles from your own strideERA CalculatorEarned run average, with the outs shownWin Percentage CalculatorTies counted the way your league counts themSlugging Percentage CalculatorTotal bases and SLG from a batting lineTrue Shooting CalculatorTS% from points, field goals and free throwsSubspace Basis CalculatorBases for span and null space, in fractions
Charts and diagrams 13
Seating Chart MakerGuests onto tables, no accountFlexbox GeneratorSet the flex properties and copy the ruleCSV ViewerRead a CSV as a sortable, filtered tableVenn Diagram MakerRegion counts for two or three listsRadar Chart MakerMulti-series polar chart, scale statedPolar Graphing CalculatorPlot r(theta), broken at the asymptotesMind Map MakerType an outline, get a map and an SVGParametric Equation GrapherPlot x(t) and y(t), broken at the polesFunction PlotterPlot up to six y = f(x) curves at onceXLSX to CSV ConverterPick the sheet, keep 0012 as text, get CSVFamily tree makerChart relatives privately, then print or save3D GrapherExplore surfaces and curves in three dimensionsSankey Diagram MakerTurn weighted flows into an editable diagram.
Everything else 1
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