Free online developer tools that keep your data private.

Format JSON, encode Base64, inspect JWTs, generate UUIDs, count words and solve everyday development tasks directly in your browser.

Built for the five-minute task. No sign-up, no uploads, no waiting. Choose a tool, paste your data and get the result immediately — your input never leaves your device.

18+ private browser tools

Formatters & Validators

JSON FormatterBeautify, minify and validate JSON instantly

Encoders & Decoders

Base64 Encode / DecodeConvert UTF-8 text and Base64 URL Encode / DecodePercent-encode URL components HTML EntitiesEscape and unescape HTML safely JWT DecoderInspect JWT headers and payloads

Generators

UUID GeneratorCreate random v4 UUIDs Password GeneratorGenerate strong random passwords Hash GeneratorSHA-1, SHA-256, SHA-384 and SHA-512 Lorem IpsumGenerate useful placeholder text Slug GeneratorTurn titles into clean URL slugs

Converters

Timestamp ConverterConvert Unix epochs and dates Number Base ConverterBinary, octal, decimal and hex Color ConverterConvert HEX, RGB and HSL values Case ConvertercamelCase, snake_case and more

Text & Dev

Regex TesterTest expressions and inspect matches Text DiffCompare added and removed lines Word CounterCount words, characters and reading time Cron ExplainerTurn a cron schedule into plain English

Why Online Dev Kit?

Every utility is client-side: your JSON, tokens, passwords and text are processed locally in JavaScript rather than uploaded to an application server. The result is a faster, more private toolbox you can keep open for everyday development work.