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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.

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.

AI image

Local AI upscaling, plus PNG chunk and ComfyUI metadata tools. Unknown fields stay labelled unknown.

Video

Inspect clips, calculate bitrate and duration, and compress short videos locally. No unrestricted transcode farm.

Time & money

Convert time zones, measure date spans, parse durations, convert currency, and add or remove VAT. Amounts and dates stay in the browser.

Units

Convert length, mass, temperature, volume, area, speed, data size, energy, pressure, power, angle, fuel economy, and time spans locally.