htmlfmt · html formatter & beautifier

No. htmlfmt runs entirely in your browser using the open-source js-beautify JavaScript library. Your code never leaves your machine. There is no server-side processing, no logging of your HTML content, and the tool works offline once the page has loaded.

Beautify (also called pretty-print or format) adds indentation and line breaks to make HTML human-readable — useful during development or code review. Minify removes all unnecessary whitespace, comments, and newlines to reduce file size — useful before deploying to production to improve page load time.

Yes. htmlfmt uses js-beautify which handles both HTML5 and XHTML markup. For XHTML, self-closing tags like <br /> and <img /> are preserved correctly. Void elements (br, hr, img, input, link, meta) are handled automatically.

Setting a wrap length (e.g. 120 characters) tells the formatter to break long attribute lists across multiple lines so no single line exceeds that width. Set it to off to disable wrapping entirely. This is especially useful for templates with many attributes on a single element.

htmlfmt's minify mode collapses inter-element whitespace and removes HTML comments. Inline <style> and <script> blocks are preserved as-is. For deeper compression of inline CSS or JS, combine htmlfmt with a dedicated CSS or JS minifier after running the HTML minification pass.