Developer tool
Your files never leave your device
Check your Network tab and see
Work starts the moment you drop a file
No daily limit, no sign-up, no watermark
Teams format HTML from templates, email exports, or scraped fragments before diffing. If the source is untrusted, formatting does not make it safe to embed — sanitise separately before render.
HTML is passed to js-beautify with indent_size 4. Tag structure drives breaks; content inside pre or code may still need manual care. Syntax highlighting in the result follows your system colour scheme.
Not an HTML validator, not a CMS, not DOMPurify. It will not fix broken tags or remove XSS. For safe preview of user HTML, use a sanitiser workflow.
That is the promise behind every tool here. Files are read in your browser tab, processed there, and discarded when you close it — never uploaded to our servers.
Format, standardize, and beautify your CSS styling rules securely.
Beautify and format minified or messy JavaScript code using standard conventions.
Easily format and indent unformatted or minified XML files.
Format, validate, prettify and beautify your JSON data instantly.
Encode or decode query strings with encodeURIComponent — in your browser, nothing uploaded.
Test, visualize, and debug Regular Expressions instantly in your browser.
