Best-effort HTML formatter. Uses 2-space indentation. Self-closing and void elements remain inline.
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What is the HTML Formatter?
An HTML Formatter is a developer tool that restructures raw or minified HTML code into a visually organized, indented format. It parses your markup, detects nesting levels, and rewrites it with consistent spacing and line breaks—turning a jumbled single line of HTML into properly formatted, scannable code.
How it works
The formatter reads your HTML input, tokenizes it into tags and content, tracks nesting depth (each child tag gets indented further), and reconstructs the code with newlines and spaces. Most formatters also correct common issues like mismatched or unclosed tags, normalize tag names to lowercase, and ensure consistent quote styles for attributes.
Examples
Input
Result
Notes
<div><p>Hello</p><span>World</span></div>
<div>
<p>Hello</p>
<span>World</span>
</div>
Single-line HTML expanded with 2-space indentation and line breaks for clarity.
Unclosed <li> tags are auto-closed; list structure becomes obvious at a glance.
How to use the HTML Formatter
Paste your HTML code—minified, malformed, or otherwise messy—into the input box.
Click 'Format' or 'Beautify'—the tool parses and restructures the markup instantly.
Review the output: tags are properly indented, attributes are organized, and nesting is clear.
Adjust indentation size (2 spaces, 4 spaces, or tabs) if desired and reformat.
Copy the formatted code back into your editor or project.
Fix any remaining validation errors flagged by the formatter (e.g., unclosed tags, invalid nesting).
Benefits
Spot bugs faster: improper nesting, missing closing tags, and attribute errors jump out in formatted code.
Collaborate easier: teammates can read and review clean, indented HTML instead of wrestling with minified soup.
Debug CSS and JavaScript: when styles or scripts aren't working, visible markup structure helps you trace selectors and dependencies.
Learn by example: reading other people's HTML is far easier when it's properly indented.
Validate before deploy: formatted code reveals structural issues before they reach production.
Save time: no need to manually add line breaks and indentation—automation does it in milliseconds.
Tips & common mistakes
Common mistakes
Assuming minified HTML is always unreadable—formatters can't fix semantic errors or poor naming, only presentation.
Formatting before fixing: some developers format broken HTML expecting it to magically work; fix logic errors first, then format.
Ignoring indentation preferences: different teams use 2, 4, or tab indentation; check your project's style guide before reformatting.
Trusting formatter output as validation: formatters may auto-close tags or make guesses; always review the result manually.
Tips
Save formatted HTML with a descriptive name (e.g., index.formatted.html) before replacing the original, in case you need to diff or revert.
Pair formatting with a linter (like HTMLHint or W3C Validator) to catch both presentation and structural issues.
Use consistent indentation across your project: pick 2 or 4 spaces and stick to it in your formatter settings.
Format before committing: reviewers will thank you for readable diffs instead of single-line files.
Frequently asked questions
Will formatting change my HTML's behavior?
No. Formatting only changes whitespace and presentation—it doesn't alter tags, attributes, or content. Your HTML will render and function identically.
Can a formatter fix broken or invalid HTML?
Partially. A formatter can auto-close obvious unclosed tags and fix some nesting issues, but it can't fix semantic errors (e.g., a <button> inside another <button>). Use a validator to catch logical errors.
Should I format minified HTML before deployment?
No—minification reduces file size for production. Format for development and debugging, but use minified HTML in production for faster page loads.
What's the difference between formatting and minifying?
Formatting adds indentation and line breaks for readability; minifying removes all whitespace to reduce file size. They're opposites.
Do I need to format HTML if I'm using a code editor?
Most modern editors (VS Code, Sublime, WebStorm) have built-in formatters; use them. A web formatter is handy for quick one-off cleanups or when you're on an unfamiliar machine.
Can I format HTML with embedded CSS or JavaScript?
Yes. Most formatters handle inline <style> and <script> blocks, though some may not perfectly indent CSS or JavaScript inside tags—expect minor cleanup needed.