How to Beautify HTML Code Online for Cleaner Markup

To beautify HTML online, paste your markup into a browser-based HTML formatter, choose an indentation style, and click Format — it re-indents the document with one tag per line while correctly handling void elements and preserving script, style, and pre content. The result is markup you can scan, diff, and hand off without wrestling with a wall of collapsed tags.

Messy HTML comes from everywhere: CMS editors, email builders, copied snippets, and minified production pages. This guide shows how to clean it up safely and what a good formatter protects along the way.

Why readable HTML matters

HTML that arrives on one line — or with inconsistent indentation from three different editors — is hard to reason about. You can't quickly see which <div> closes where, nested components blur together, and code reviews take longer than they should. Re-indenting restores the visual structure so the document tree matches the way you think about the page.

The HTML Formatter is built for front-end developers, email coders, and anyone inspecting markup from a CMS. Instead of running a full, unforgiving HTML parser, it tokenizes the source and tracks nesting depth, which makes it fast and tolerant of the imperfect real-world markup you actually encounter.

How to format HTML in your browser

1. Paste your HTML into the input box — a full page, a component, or a copied fragment.
2. Choose your indentation: 2 spaces, 4 spaces, or tabs.
3. Click Format HTML. Each tag and text run is printed at the right depth, void elements are handled correctly, and protected regions stay untouched.
4. Copy the beautified markup or download it as an .html file.

What a good formatter protects

The difference between a formatter you can trust and one that mangles your page comes down to what it leaves alone. Here's how this tool treats the tricky parts of HTML.

Content type	What happens
Block elements (div, section, ul)	Re-indented by nesting depth
Void elements (br, img, meta, input)	No fake close tag; following content not over-indented
<pre> and <textarea>	Content preserved verbatim — whitespace is significant
<script> and <style>	Passed through byte-for-byte
Comments and doctype	Kept in place

That last point is important: because JavaScript and CSS inside the page are untouched, you never risk breaking a script by re-indenting the HTML around it. If you also want that embedded code formatted, run it through the dedicated JavaScript or CSS formatter first.

Key features and benefits

• Real nesting-based indentation so the output reflects the actual document tree.
• Correct void-element handling for br, img, meta, input, and the rest.
• Verbatim preservation of pre, script, style, and textarea content.
• Keeps comments and the doctype declaration intact.
• Your choice of indentation — 2 spaces, 4 spaces, or tabs.
• 100% client-side — markup never leaves your browser, works offline, and is free.

Try the HTML Formatter now — it's free and runs entirely in your browser.

Frequently asked questions

How do I beautify HTML code online?

Paste the markup into the HTML Formatter, choose an indentation style, and click Format HTML. The tool splits the source into tags and text, tracks how deeply each element is nested, and re-prints everything with one tag per line and consistent indentation.

Will formatting break my page layout?

Almost never. Browsers collapse whitespace between block elements, so re-indenting has no visual effect there. The one edge case is whitespace-sensitive inline content, which is why the formatter protects <pre> and <textarea> exactly.

What are void elements in HTML?

Void elements like <br>, <img>, <input>, <meta>, and <link> can't have children and never take a closing tag. The formatter knows the full list, so it doesn't indent the content after them as if those tags were still open.

Does it change my inline JavaScript or CSS?

No. Anything between <script> and </script> or <style> and </style> is passed through unchanged. To format that code too, use the JavaScript or CSS formatter on it separately.

Can it fix invalid HTML?

It re-indents what you give it but doesn't repair markup — unclosed tags stay unclosed. Because it tolerates imperfect HTML rather than rejecting it, you can still use it to make broken markup readable enough to fix by hand.

Related free tools

• HTML Minifier — compress the page back down for production.
• CSS Formatter — beautify your stylesheets.
• JavaScript Formatter — tidy up embedded or standalone JS.
• XML Formatter — format XML documents and feeds.

Built by ByteVancer

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