Small coding tools that run in your browser — no install, no account.
Write JavaScript, run it in a sandbox, and inspect console output. Drafts autosave in this browser.
Pretty-print, minify, and validate JSON with adjustable indent.
Match patterns against sample text with live highlights and groups.
Base64, URL, and HTML entity encode or decode in place.
SHA-1 / 256 / 512 digests and random UUID v4 via Web Crypto.
Compare two texts line by line and spot additions and removals.
Inspect header and payload claims. Decode only — no signature check.
Write Markdown and preview HTML side by side. Autosaves locally.