Development, AI, SEO and GitHub — all in one place.

Beautify, minify and validate JSON, sort by key and see the exact error position. Everything runs in your browser — your data never leaves your device.

Convert text to and from Base64, with URL-safe output and full UTF-8 support for Chinese and emoji. Runs entirely in your browser.

Percent-encode and decode, with separate modes for a parameter value and a whole URL, plus a breakdown that decodes each query parameter.

Generate UUID v4 (random) and v7 (time-sortable) in bulk, with uppercase and hyphen-free options, using the browser's cryptographic randomness.

Convert between Unix timestamps, ISO 8601 and local time, detecting seconds or milliseconds automatically and showing the time zone and relative time.

Decode a JWT's header and payload, with expiry times rendered as readable dates. Decoding only — the token never leaves your browser and is never stored.

Compute SHA-1, SHA-256, SHA-384 and SHA-512 with Web Crypto, in hex or Base64, optionally all at once.

Test regular expressions live: every match position, captured groups and a replacement preview, with support for the g, i and m flags.

JSON, Base64, JWT, regex, cron and the other everyday development essentials.

CSS gradient and shadow generators with a live preview and one-click copy.

Convert and compress images in the browser — the files never leave your device.

Meta tags, Open Graph and real website performance analysis.

READMEs, commit messages and repository health analysis.

Prompt optimization, PRD generation and other tools that need real reasoning.