Web & Dev
8 toolsDiff text, track changes in a revision, test regular expressions, preview Markdown and more.
Editors4
- Markdown EditorWrite Markdown with a live GitHub-flavoured preview, a formatting toolbar, and export to HTML or PDF
- Code editorWrite, prettify and syntax-check code in 90 languages, in the browser
- Mermaid editorWrite Mermaid, see the diagram as you type, then print it or export SVG, PNG and Markdown
- Track changesEdit a text and show every change as a redline — accept or reject each one, comment, and share it all as a link
Developer tools4
- DiffCompare text by line, word or character — unified or side by side — and export or apply patches
- RegexTest JavaScript regular expressions live — highlighted matches, capture groups, replace preview and a cheat sheet
- JWTbetaDecode a JSON Web Token, check its expiry, verify the signature with a secret or public key, or sign a new one
- URL shortenerbetaTurn a URL of up to 200,000 characters into a short link — best-effort, made for handing off, not forever