HTML Formatter / Beautifier

Tool functionality: Format (beautify) — reorganizes tags and indentation for readability. Validate — simple tag-matching validator for common structural issues (unexpected closing tags, missing closing tags, and mismatched nesting). This validator is lightweight and aims at quick checks — for full validation use a dedicated HTML validator (W3C).

Tool functionality: Format (beautify) — reorganizes tags and indentation for readability. Validate — simple tag-matching validator for common structural issues (unexpected closing tags, missing closing tags, and mismatched nesting). This validator is lightweight and aims at quick checks — for full validation use a dedicated HTML validator (W3C).

Paste your HTML, click Format to beautify or Validate to detect common tag errors.

HTML Input <!-- Example --> <div><h2>Title</h2><p>Some <b>text</b><img src="https://blogger.googleusercontent.com/img/a/AVvXsEhoY4HK9d_OvudqQmjS9xjtpoMSey7xbNS2yv0P1F74bzzh6isFE3kSzZRko8b-I3gfUk5PMYDPd69pU5NbLQI2B7BILnEX-I7_9LGEt3Y7LoztirRenNQ1MkGF2KUUl4lLI3hClruYnC47qE9sHVCrNZJQo-Hboc3jyP3DxlnblzYoDS-nMZnB9FgIggXS=s150" alt="x"></p></div>

Tip: Use the Format button to prettify. Choose indentation size as needed.

Indent 2 spaces 4 spaces 1 space 8 spaces Tab

Output

Examples

Why use an HTML Formatter / Beautifier?

• Readability: Proper indentation helps humans understand structure quickly.
• Debugging: Cleaner HTML makes it easier to spot missing tags and logic issues.
• Collaboration: Standard formatting reduces diff noise and improves reviews.
• Learning: Students and juniors learn correct nesting and structure by seeing formatted markup.

How to use

1. Paste or type HTML in the HTML Input box.
2. Choose indentation size (2 / 4 / tab).
3. Click Format / Beautify to generate pretty output in the output box.
4. Click Validate to run a quick structure check. Check the validation report for any unexpected/missing tags.
5. Click Minify to compress by removing extra whitespace (useful before deployment).
6. Use Copy Output to copy the result to clipboard.

Quick Actions

Useful tips and safety notes

• Void elements like <br>, <img>, <input> don't need closing tags.
• Validator is best-effort — for HTML5 spec validation, run your page through W3C validator.
• Large documents may take longer to pretty-print — try with smaller snippets first.

FAQ

No — it's a quick structural checker that finds common mismatched or missing tags. For full validation against HTML5 specs, use an authoritative validator such as the W3C Validator.

The formatter reorganizes whitespace and indentation only. It preserves tag text, attributes, and script/style content. But always review formatting results before deploying.

This demo runs fully in your browser; nothing is sent to external servers. If you implement this on a server, check the privacy policy for that deployment.