Free Online HTML Formatter & Beautifier

Paste HTML above and click Beautify to re-indent nested markup with your preferred spacing, Validate to check that every tag is properly closed and nested, or Minify to strip comments and whitespace for production. Everything runs in your browser — templates, email markup and CMS snippets are never uploaded.

When you need an HTML formatter

• CMS and page-builder exports — WordPress, Wix and email builders generate deeply nested, unindented markup that is painful to edit by hand.
• Email templates — HTML email relies on nested tables; re-indenting makes the structure editable again.
• Copied snippets — code lifted from view-source or DevTools usually arrives with broken indentation.
• Template debugging — a missing </div> shifts an entire layout; the tag-balance check finds it with a line number.

How the tag-balance validator works

Browsers silently repair broken HTML, which is exactly why layout bugs from unclosed tags are so hard to spot — the page renders, just wrongly. This validator does what the browser will not: it walks your markup and reports the first unclosed or unexpected closing tag with its line number. Void elements like <br>, <img> and <meta> are correctly treated as self-contained.

Beautify vs minify for HTML

Beautified HTML is for people: one element per line, children indented under parents. Minified HTML is for production: comments removed and inter-tag whitespace collapsed, typically shaving 5–20% off page weight, which helps Core Web Vitals. Keep readable source in your repository and minify at deploy time. For background, read what minification is and how much it actually saves.

Frequently asked questions

Will minifying break my page?

Almost never — whitespace between block elements is insignificant. The one caution is inline elements where a space between tags is rendered; review text-heavy fragments after minifying.

Does it format embedded CSS or JavaScript inside the page?

Contents of <style> and <script> blocks are preserved as-is. For those, paste them into the dedicated CSS formatter or JavaScript formatter.

Is this an HTML validator like W3C?

It checks structural tag balance, the most common practical failure. The W3C validator additionally checks attribute legality against the HTML spec — both are useful at different depths.