Free HTML Formatter Online
Beautify and indent HTML markup instantly — powered by js-beautify, running entirely in your browser.
How it works
Paste HTML
Paste your raw, minified, or messy HTML into the input.
Format
Click Format HTML or press Ctrl+Enter. The formatter indents tags and attributes.
Copy or download
Copy the formatted HTML or download it as a .html file.
Browser-only
Uses js-beautify — bundled locally. Your code never leaves your browser.
Common use cases
CMS output cleanup
CMS-generated HTML is often a single line. Format it before editing or reviewing template changes.
Email template editing
HTML email templates come from tools in minified form. Format before editing to see the structure clearly.
Legacy code readability
Format old HTML files with inconsistent indentation before refactoring.
Diff readability
Format both versions of an HTML file before running a diff to avoid false positives from whitespace differences.
Frequently asked questions
Does this validate HTML?
No — the formatter reformats but does not validate. It uses js-beautify which is permissive and handles imperfect HTML.
Can it format inline SVG or CSS?
js-beautify handles inline CSS in <style> tags and some inline attributes, but for dedicated CSS/SVG formatting use the CSS Formatter.
Does it handle HTML5 void elements?
Yes — the formatter knows about void elements like <br>, <img>, <input> and formats them correctly without adding closing tags.
Is my code uploaded?
No. js-beautify is bundled in /lib/ — no CDN call at runtime. Your code is formatted locally.