Small tools that do one job.
Colour, images, type, print and maths. The utilities I reach for often enough to want them in one place.
Nothing here asks you to sign in, and nothing you open leaves your machine. Every tool runs in the browser tab you already have open. Close it and there is no account, no history and no file sitting on someone else's disk.
They are free. If one saves you an afternoon, that is the whole point.
Most used
4Everything
162Social Media
5Colour
10Colour Blindness SimulatorSimulate how colours appear to colour blind usersColour ConverterConvert between colour formatsContrast CheckerCheck WCAG colour contrast complianceGradient GeneratorCreate linear, corner, and mesh gradientsHarmony GeneratorGenerate colour harmoniesPalette CollectionBrowse curated colour palettesPalette ExtractorExtract colour palettes from imagesPalette GeneratorGenerate beautiful colour palettesPixel PickerSample colours from any image with a zoom loupeTailwind Shade GeneratorGenerate Tailwind colour scales
Images & Assets
18SubstrataBetaNewEdit, arrange and mark up images in the browserArtwork EnhancerAdd colour noise overlay to artworkFavicon GeneratorGenerate favicons from any imageImage ClipperTrim transparent edges from PNGs to the smallest dimensionsImage ConverterConvert between PNG, JPEG, WebP, JXL, GIF, BMP, TIFF, ICO, ICNS with resize and format optionsImage SplitterSplit images into tilesImage StitcherNewCombine multiple images into oneImage TracerTrace raster images to SVG vectorsPaste ImagePaste and download an image from your clipboardPlaceholder GeneratorGenerate placeholder imagesSVG OptimiserOptimise and minify SVG filesBase64 Image EncoderNewConvert images to Base64 strings for CSS/HTML embeddingDevice MockupDrop a screenshot into a device frameEXIF ViewerRead and strip photo metadataImage CompressorShrink images with a quality dialImage EffectsFilters and adjustments on canvasImage ResizerResize by pixels or percentageSVG to PNGRasterise SVG at any scale
Typography & Text
23Document ConverterNewConvert documents between Markdown, HTML, Word, LaTeX, EPUB and moreText EditorNewDistraction-free Markdown writerFont File ExplorerExplore font file contentsGlyph BrowserBrowse unicode glyphsLarge TypeNewText, but bigLine Height CalculatorCalculate optimal line heightsPaper SizesReference for paper dimensionsPX to REMConvert pixels to rem unitsText DiffCompare two texts and highlight differencesTypography CalculatorConvert between typographic unitsWord CounterCount words, characters and moreASCII ArtRender text as figlet-style bannersCase ConverterSwitch text between camel snake kebab title and moreEmoji PickerSearch emoji and copy themFont PairingTry typeface pairings side by sideHTML EntitiesSearch named and numeric entitiesMarkdown TableBuild and format Markdown tablesReadability CheckerGrade level and reading ease scoresSlug GeneratorTurn a title into a clean URL slugText RepeaterRepeat text with separatorsText SimilarityCompare two texts and score overlapText to SpeechRead text aloud with system voicesWord FrequencyRank the words in a text
Print & Production
14PDF PreflightAnalyse PDFs for print-readiness issuesPrint ImposerImpose PDF pages for booklet, saddle-stitch, and N-up printingZine ImposerImpose single-sheet zines: 8-page mini-zine and accordion foldsAdd Page NumbersStamp page numbers onto a PDF with position and format controlCompress PDFShrink a PDF in the browserHTML to PDFRender HTML to a PDF pageImages to PDFCombine images into one PDFPDF Metadata EditorEdit title author and keywordsPDF to ImageExport PDF pages as imagesPDF to TextExtract all text from a PDFPDF WatermarkStamp a watermark across pagesRotate PDFTurn pages and saveSign PDFPlace a drawn or typed signatureWord to PDFConvert docx to PDF in the browser
Other Tools
8Barcode GeneratorGenerate Data Matrix, Aztec, PDF417, Code 128, EAN-13, and moreCipher DecoderNewDecode classical ciphers manually or auto-detect the cipherMeta Tag GeneratorGenerate HTML meta tagsQR GeneratorGenerate styled QR codes with custom colors, shapes, and logosRegex TesterTest regular expressionsTailwind Cheat SheetQuick reference for Tailwind classesText ScratchpadText editor with manipulation toolsPomodoro TimerFocus timer with work and break cycles
Calculators
12Algebra CalculatorSymbolic algebra: simplify, factor, solve, derivativesBase ConverterConvert between decimal, hex, binary, and octalEncoding ToolsBase64, URL encoding, and hash generationGraph CalculatorPlot and visualise mathematical functionsScientific CalculatorFull-featured scientific calculator with historyTime CalculatorUnix timestamps, date arithmetic, timezone conversionUnit ConverterConvert between units of length, weight, data, and moreAge CalculatorWork out exact age and time between two datesAspect Ratio CalculatorScale dimensions while keeping the ratioBitwise CalculatorAND OR XOR and shifts with live binary viewPercentage CalculatorPercentages change and differenceStatistics CalculatorMean median deviation and quartiles
Turbo-nerd Shit
1Developer
30AES EncryptionEncrypt and decrypt text with AES using the Web Crypto APIAPI Mock ResponseBuild realistic mock API responses for testingBrowser Feature SupportCheck what your browser actually supports right nowChangelog GeneratorTurn commit lines into a formatted changelogChmod CalculatorConvert between symbolic and octal file permissionsCode FormatterFormat code in several languagesCode ScreenshotTurn a snippet into a shareable imageCommit Message BuilderBuild a conventional commit messageCron ParserExplain a cron expression in plain EnglishCrontab GeneratorBuild a cron expression from a scheduleCSS FormatterFormat and tidy CSSCSS MinifierStrip whitespace and comments from CSSCSV ViewerOpen a CSV as a sortable filterable tableDockerfile GeneratorScaffold a Dockerfile for a common stackEnv EditorEdit and validate dotenv filesGitHub Actions GeneratorScaffold a workflow YAMLGitignore GeneratorCompose a gitignore from stack templatesHash GeneratorMD5 SHA-1 SHA-256 and SHA-512 checksumsHex ViewerInspect any file as a hex dumpJavaScript MinifierMinify JavaScript in the browserJSON FormatterFormat validate and inspect JSONJSON Path FinderQuery JSON and get the path to any valueJSON Schema GeneratorInfer a schema from sample JSONJSON to TypeScriptGenerate interfaces from JSONJWT DecoderDecode and inspect a token locallyPackage JSON BuilderCompose a package manifestReadme GeneratorBuild a project readme from sectionsSQL FormatterFormat and tidy SQLSubnet CalculatorCIDR ranges masks and host countsXML FormatterFormat and validate XML
CSS & Design
14Border Radius GeneratorShape corners visually and copy the CSSBox Shadow GeneratorStack and tune CSS shadows with a live previewButton GeneratorDesign a button and copy its CSSClip Path GeneratorDraw a clip-path and copy the CSSCSS Animation GeneratorBuild keyframe animations visuallyCubic Bezier EditorDraw an easing curve and copy itDesign Token ConverterMove tokens between JSON CSS and TailwindFlexbox GeneratorLay out with flexbox and copy the CSSGlassmorphism GeneratorFrosted glass panels with copyable CSSGrid GeneratorBuild a CSS grid visuallyNeumorphism GeneratorSoft raised UI surfaces with CSSSpecificity CalculatorScore a selector and see which rule winsSVG Path EditorEdit path data with handlesTailwind PreviewPreview utility classes live
Converters
12CSV to JSONConvert CSV into JSONHTML to JSXConvert HTML into valid JSXJSON to CSVFlatten JSON into CSVJSON to XMLConvert JSON into XMLMorse CodeTranslate text to and from MorsePunycode ConverterConvert internationalised domainsTailwind to CSSExpand utilities into plain CSSTimestamp ConverterUnix time to dates and backTOML and JSONConvert between TOML and JSONXML to JSONConvert XML into JSONYAML and JSONConvert between YAML and JSONYAML to CSVFlatten YAML into CSV
Generators
9Dummy Data GeneratorGenerate fake records as JSON or CSVEmail Signature GeneratorBuild an HTML email signatureLorem IpsumGenerate placeholder copyMock Data GeneratorBuild rows from a schema or column builderPassword GeneratorStrong random passwords with rulesPrivacy Policy GeneratorDraft a policy from your answersRandom Name GeneratorNames for test data and mockupsTerms GeneratorDraft terms from your answersUUID GeneratorGenerate v4 and v7 identifiers
Web & SEO
6Cookie Consent GeneratorGenerate a consent banner snippetHreflang GeneratorBuild hreflang tags for a locale setHtaccess GeneratorGenerate redirect and header rulesJSON-LD GeneratorBuild structured data for a pageRobots.txt GeneratorBuild crawl rules and sitemap linesSitemap GeneratorBuild an XML sitemap from URLs
About
I did not build these from scratch, and it would be poor form to imply otherwise. This suite is my adaptation of delphitools (opens in new tab) by Ruby Morgan Voigt, released under the MIT licence. I have rebranded it, removed the parts I could not licence for a commercial site, and host it here so the tools stay available and stay private.
The original is excellent and still online. If you like what these do, go and see the rest of her work.
Full licence text, attributions and what changed are on the credits page.
Adapted and hosted by
Original source
Built with Next.js, Tailwind CSS and shadcn/ui. All processing happens locally in your browser.