Tools
Browse 72 working browser tools. Every interactive page includes original explanations, examples, troubleshooting, tested limits, and a clear account of what happens to your input.
DeveloperJSON, YAML, CSV, XML, TOML, dotenv, Base64, JWT, hashes, and other local text tools. No account required.ImageConvert, resize, compress, and inspect images locally. EXIF and GPS stay on your device unless you choose to copy them.AI imageLocal AI upscaling, plus PNG chunk and ComfyUI metadata tools. Unknown fields stay labelled unknown.VideoInspect clips, calculate bitrate and duration, and compress short videos locally. No unrestricted transcode farm.Time & moneyConvert time zones, measure date spans, parse durations, convert currency, and add or remove VAT. Amounts and dates stay in the browser.UnitsConvert length, mass, temperature, volume, area, speed, data size, energy, pressure, power, angle, fuel economy, and time spans locally.
Developer
JSON, YAML, CSV, XML, TOML, dotenv, Base64, JWT, hashes, and other local text tools. No account required.
developerJSON formatterPretty-print JSON locally, or diff two documents by JSON pointer.developerJSON minifierCollapse JSON to a single compact line without sending it anywhere.developerJSON validatorCheck whether text is valid JSON, with a useful error location.developerJSON repair helperRebuild almost-JSON into strict JSON, then read the warning before you trust it.developerJSON to YAMLTurn JSON into readable YAML without leaving your machine.developerYAML to JSONParse YAML into JSON without custom tags or server-side processing.developerJSON to CSVTurn a JSON array into CSV without dropping nested values on the floor.developerCSV to JSONParse real CSV into JSON without breaking on commas inside quotes.developerXML to JSONMap XML into JSON while keeping attributes and text nodes visible.developerJSON to XMLBuild XML from JSON when you already know the root element name.developerTOML to JSONTurn TOML config into JSON without uploading your secrets file.developerJSON to TOMLSerialise JSON config as TOML when the root is an object.developer.env to JSONParse a .env file into JSON without sending secrets to a server.developerJSON to .envWrite a .env file from a JSON object without guessing nested key names.developerBase64 encoder and decoderEncode or decode Base64 without uploading the payload.developerURL encoder and decoderApply or reverse percent-encoding without a round trip to a server.developerHTML entity encoder and decoderEscape or unescape HTML entities without rendering the input.developerJWT decoderRead a JWT locally, or mint an unsigned fixture. This is not signature validation.developerUUID generatorCreate random UUID v4 or time-sortable v7 values without a network call.developerHash generatorCompute common hashes locally. MD5 and SHA-1 are labelled as legacy.developerUNIX timestamp converterTranslate UNIX time and ISO-8601 without a timezone guessing game.developerCron expression explainerRead a cron expression in plain language, or assemble one from fields.developerRegex testerTry a JavaScript regex locally with safe highlighting.developerMarkdown to HTMLTurn Markdown into HTML source without previewing untrusted markup.developerHTML to MarkdownFlatten HTML into Markdown without rendering the original markup.developerSQL formatterPretty-print SQL without sending the query to a database or a server.
Image
Convert, resize, compress, and inspect images locally. EXIF and GPS stay on your device unless you choose to copy them.
imageImage converterConvert images on-device, with honest limits for animation and AVIF support.imageImage resizerCrop and resize images on-device without a trip through a remote farm.imageImage compressorAuto-compress locally to the smallest high-quality JPEG, WebP, PNG, or AVIF.imageImage information viewerRead width, height, and file size without uploading the picture.imageEXIF viewerInspect EXIF and GPS locally, with tags treated as untrusted strings.imageImage metadata removerStrip location and camera metadata before you share a photo.imageImage colour palette extractorPull a handful of dominant colours from an image without uploading it.imageImage to Base64Turn an image into Base64 or a data URI without uploading it.imageBase64 to imageTurn a data URI or Base64 string back into an image file.imageFavicon generatorBuild favicon PNGs and a PNG-in-ICO locally from a square source image.imageSocial image resizerExport named social sizes locally, with the pixel dimensions stated up front.imageImage aspect-ratio calculatorSimplify pixel dimensions to a ratio such as 16:9 or 4:3.
AI image
Local AI upscaling, plus PNG chunk and ComfyUI metadata tools. Unknown fields stay labelled unknown.
ai-imageAI image upscalerEnlarge a small image in your browser, then compare with a before/after slider.ai-imageAI-image metadata viewerSee whether an image still contains AI prompts — and say so only when it does.ai-imagePNG chunk inspectorSee every PNG chunk, including the ones that hide prompts.ai-imageComfyUI workflow extractorPull ComfyUI workflow JSON out of a PNG when the chunks are still there.ai-imageAI-image metadata removerStrip prompts and workflows from an image before you share it.ai-imageWorkflow JSON formatterCheck workflow JSON is parseable before you share or import it.ai-imageWorkflow JSON comparisonSee whether two workflow files are the same after key sorting.ai-imagePrompt cleanerTidy a prompt’s whitespace without sending it to a model.ai-imagePrompt to JSONTurn a comma-separated prompt into JSON tokens without a model.
Video
Inspect clips, calculate bitrate and duration, and compress short videos locally. No unrestricted transcode farm.
videoVideo compressorAuto-compress a short clip locally to MP4 or WebM, using this browser’s encoder.videoVideo file inspectorRead duration and resolution from a video without uploading it.videoVideo bitrate calculatorTurn file size and duration into an estimated bitrate, locally.videoVideo aspect-ratio calculatorGet 16:9 or 9:16 from pixel dimensions without a timeline app.videoFrame-rate calculatorWork out frame counts and fps locally, including 23.976 caveats.videoDuration and file-size calculatorEstimate how big a clip will be from duration and bitrate.videoSocial video export settingsUse researched starting points for social exports, with the re-encode caveat attached.
Time & money
Convert time zones, measure date spans, parse durations, convert currency, and add or remove VAT. Amounts and dates stay in the browser.
time-moneyTime zone converterConvert a meeting time across IANA zones without sending the date anywhere.time-moneyDate differenceCount days and weekdays between two dates without a spreadsheet.time-moneyDuration calculatorTurn messy duration strings into seconds, clocks, and ISO-8601.time-moneyCurrency converterConvert amounts locally, with an optional published rate table.time-moneyVAT and percent calculatorAdd VAT, strip VAT, or measure a discount without a spreadsheet.
Units
Convert length, mass, temperature, volume, area, speed, data size, energy, pressure, power, angle, fuel economy, and time spans locally.
unitsLength converterConvert millimetres, feet, miles, and nautical miles without a spreadsheet.unitsMass converterConvert grams, pounds, stone, and metric tonnes without mixing US and UK tons.unitsTemperature converterConvert °C, °F, Kelvin, and Rankine without an offset mistake.unitsVolume converterConvert litres, cups, and gallons without mixing US and imperial.unitsArea converterConvert square metres, acres, and hectares without a survey plat.unitsSpeed converterConvert km/h, mph, and knots without treating Mach as a constant.unitsData size converterConvert MB and MiB without pretending 1024 and 1000 are the same.unitsEnergy converterConvert kWh, kilocalories, and BTU without mixing food Calories.unitsPressure converterConvert bar, psi, and atmospheres without treating mmHg as weather magic.unitsPower converterConvert kW and horsepower without mixing mechanical hp and metric PS.unitsAngle converterConvert degrees, radians, and turns without a π rounding surprise you cannot inspect.unitsFuel economy converterConvert L/100 km and mpg without using the wrong gallon.unitsTime units converterConvert hours, days, and milliseconds without inventing a month length.