HTML Formatter

What is HTML Formatter?

HTML Formatter beautifies, indents, and minifies HTML documents with configurable indentation options. It properly handles self-closing tags, attribute alignment, inline elements, pre and code blocks (preserving their whitespace), and embedded scripts and styles. The formatter detects and reports common HTML errors like unclosed tags and mismatched nesting.

Frontend developers debugging template output, email developers formatting HTML templates, and build engineers optimizing production HTML. The tool runs entirely in your browser — your data never leaves your device.

How to Use HTML Formatter

1. Paste your raw or minified HTML into the input editor
2. Select your indentation preference — 2 spaces, 4 spaces, or tabs
3. Choose between beautify mode for readable output or minify mode for compact output
4. Review the formatted result with syntax highlighting and error indicators
5. Copy the formatted HTML or download it as an .html file

Common Use Cases

• Beautifying minified HTML output from build tools for debugging template issues
• Formatting HTML email templates that are often written as single-line strings
• Cleaning up HTML generated by WYSIWYG editors that produce messy, deeply nested markup
• Preparing HTML snippets for documentation and code examples with consistent indentation
• Minifying HTML templates for production to reduce page size and improve load times

Pro Tips

• The formatter preserves whitespace inside pre and code tags — content within these elements is never reformatted to maintain intended display
• Use the minify mode for production HTML — it removes comments, collapses whitespace, and strips optional closing tags, typically reducing size by 10-20 percent
• Enable attribute sorting to alphabetize HTML attributes — this makes diffing and reviewing HTML changes much easier in version control

Why Use This Tool?

• Privacy-first: All processing happens locally in your browser. No data is transmitted to any server.
• No installation required: Works in any modern browser on desktop or mobile.
• Completely free: No account, no credit card, no usage caps.
• Fast and reliable: Powered by modern Web APIs for near-instant results.

Related Concepts

Learn more about related topics: HTML5 spec, Void elements, DOCTYPE, Emmet.

Frequently Asked Questions