All tools

Twenty-two free utilities. Each one runs in your browser; nothing is uploaded, nothing is stored.

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Developer tools

JSON Formatter & ValidatorBeautify, validate and minify JSON, with the error position. Base64 Encoder / DecoderText or files to Base64 and back, UTF-8 safe. URL Encode / DecodeEscape a component or a full URL, then decode it back. MD5 / SHA-256 Hash GeneratorMD5, SHA-1, SHA-256, SHA-384 and SHA-512 in one pass. CSS MinifierRemove comments and whitespace from CSS, with the bytes saved. UUID v4 GeneratorGenerate up to 100 random version-4 UUIDs at once. JWT DebuggerRead a token's header and payload; expiry decoded to dates. SQL FormatterSplit clauses onto their own lines and upper-case keywords. Character CounterCharacters, words, lines and UTF-8 bytes as you type. Case Converterlower, UPPER, Title, Sentence, camel, snake, kebab, Pascal.

Converters

Unix Timestamp ConverterSeconds and milliseconds to dates, in UTC and local time. Unit ConverterLength, mass, volume, temperature, speed, data and more. Time Zone ConverterConvert a date and time between zones, DST handled. Age CalculatorExact age in years, months and days, plus next birthday.

Design and colour

RGB ⇄ HEX ConverterRGB, HEX and HSL, with a colour preview. Color Picker / ConverterPick a colour and copy it as HEX, RGB or a CSS variable.

Everyday utilities

Percentage CalculatorX% of Y, X is what % of Y, and percentage change. BMI CalculatorBody mass index from metric or imperial height and weight. Password GeneratorStrong local passwords with length and character options. Placeholder Text GeneratorPlaceholder paragraphs for mockups and layout tests. Word CounterWords, characters, sentences and reading time. Trip Fuel Cost CalculatorDistance × consumption × fuel price, in litres or gallons.