Does this validate my HTML for correctness?

No — this is a formatter, not a validator. It will happily indent HTML that is technically invalid (mismatched tags, missing required attributes) because its job is readability, not spec compliance. Use a dedicated HTML validator if you need strict conformance checking.

Will beautifying change how my page renders?

No. Only whitespace and line breaks between tags are added — the actual tags, attributes, text content, and nesting structure are untouched, so the rendered output is identical before and after.

Why does content inside my tag stay on one messy line?

That is intentional. Script, style, pre, and textarea content is preserved verbatim rather than reformatted, because changing whitespace inside a block or reflowing JavaScript could alter what the page actually does. Reformat the JS separately with the JS Beautifier if you need it indented too.

What is a void element and why does it matter for formatting?

Void elements — , , , , , , and a handful of others — never have a closing tag or children by spec, even without a trailing slash. A formatter that does not know this list will misindent everything nested after one, treating it as a container that needs a matching close tag it will never find.

Why does properly indented HTML make Git diffs more useful?

A diff on a single minified line of HTML shows the whole line as changed even if only one attribute changed, because diff tools compare line by line. Formatted HTML with each element on its own line lets Git show exactly which element was added, removed, or modified.

Does it support HTML comments and DOCTYPE declarations?

Yes — both are recognized as distinct token types, preserved exactly, and placed at the correct indentation depth rather than being stripped or mangled.

Is it safe to paste HTML containing sensitive markup or business logic?

Yes — tokenizing and rendering happen entirely in your browser tab using plain JavaScript. Nothing is uploaded anywhere, so internal admin templates, unpublished pages, or proprietary CMS exports are safe to format here.

All ToolsHTML Beautifier

HTML Beautifier

Format and beautify HTML code with proper indentation — paste messy HTML and get clean, readable markup instantly.

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HTML Beautifier

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What is HTML Beautifier?

HTML Beautifier expands minified, server-collapsed, or inconsistently indented HTML into clean markup with predictable 2-space nesting — the kind of formatting you would write by hand if you had the patience to indent every tag manually.

Most HTML you encounter in the wild is not written by a human in its final form. It arrives minified by a build tool, collapsed into one line by a server-side template engine, copy-pasted from a "View Source" of a production site, or exported from a CMS or email platform that strips whitespace to save bytes. Reading structure in that state means mentally tracking bracket depth across a wall of text, which is slow and error-prone — a missing </div> six hundred characters into a single line is nearly impossible to spot by eye but jumps out instantly once the same markup is properly indented.

The reason this matters more than it might seem is that indentation is really a visualization of the DOM tree. Every level of indent corresponds to a level of nesting, so well-formatted HTML lets you see the actual document structure — which elements contain which, where a section starts and ends — without mentally parsing tags. That is the same reason version control diffs are so much more useful against formatted HTML than minified HTML: a single-line diff on collapsed markup shows a wall of red and green with no way to tell what structurally changed, while a diff on indented HTML shows exactly which element was added, moved, or removed.

Building a correct HTML formatter is harder than it looks, and it is where naive regex-based tools tend to fail. HTML allows attribute values to contain a literal > character (as long as it is inside quotes), self-closing "void" elements like <br> and <img> that never take a closing tag, and elements like <script>, <style>, and <pre> whose content must be preserved exactly — reformatting the JavaScript inside a <script> tag or reflowing whitespace inside a <pre> block would silently change behavior. A formatter that just inserts a newline after every > will break on all three of those cases. This tool avoids that by tokenizing the HTML properly first — scanning character by character with awareness of quoted attribute strings — before deciding how to indent anything.

How It Works

The formatter runs in two passes. The first pass tokenizes the raw HTML character by character into typed tokens: doctype declarations, opening tags, closing tags, self-closing void elements, plain text, comments, and raw content blocks — critically, it tracks whether it is inside a quoted attribute string so a > character inside href="foo>bar" never gets mistaken for the end of a tag. The second pass walks that token list and renders it with 2-space indentation per nesting depth, incrementing indent on each opening tag and decrementing on each matching close. Content inside <script>, <style>, <pre>, and <textarea> is collected and re-emitted verbatim rather than reformatted, since altering whitespace inside those elements can change what they actually do. Short elements containing only a small amount of text (like <h1>Title</h1>) are kept on a single line rather than needlessly split across three, matching how most developers format HTML by hand.

How to Use

1
Paste your HTML
Paste raw, minified, server-rendered, or badly indented HTML into the left editor — a full page, a template fragment, or output copied from browser DevTools all work.
2
Click Beautify HTML
The tokenizer runs instantly and rebuilds the markup with consistent 2-space indentation, correct nesting, and sensible line breaks.
3
Scan the structure
With each element now on its own indented line, trace the nesting visually to confirm tags close where you expect and spot any structural mistakes that were invisible in the collapsed version.
4
Copy the formatted output
Click Copy to grab the beautified HTML from the right panel and paste it into your editor, CMS, or documentation.

Who Uses This Tool

🖥️

Inspecting Generated Markup

Expand server-rendered or framework-generated HTML to understand the DOM structure your code is producing.

🎨

Template Development

Reformat email or CMS templates that have been collapsed into a single line so they are easier to edit.

📚

Documentation Samples

Clean up HTML code snippets before embedding them in technical documentation or tutorials.

🔄

Legacy Code Cleanup

Reindent hand-written HTML files from older projects to bring them up to modern readability standards.

🧑‍🏫

Teaching Markup

Format minified example files used in coding courses so students can see clear nesting and indentation.

🛠️

Debugging Nesting Issues

Visualize the tag hierarchy of messy HTML to spot unclosed or incorrectly nested elements quickly.

Why Choose This Tool

Proper Tokenizer

Uses a two-pass tokenizer rather than regex substitution, so angle brackets inside attribute values never confuse the formatter.

Raw Block Preservation

Content inside <script>, <style>, and <pre> tags is preserved verbatim so your code and styles are never corrupted.

Void Element Awareness

Correctly identifies self-closing elements like <br>, <img>, and <input> so they are never given erroneous closing tags.

Inline Block Optimization

Short text-only elements like <h1>Title</h1> are kept on one line for cleaner, more readable output.

Comment Support

HTML comments and DOCTYPE declarations are correctly indented and preserved at the right nesting depth.

No Upload Needed

Everything runs in your browser so large HTML files are processed instantly with complete privacy.

Also Try

HTML Compressor CSS Beautifier JS Beautifier HTML to PDF HTML to Word JSON Formatter

Key Benefits

Proper tokenizer — handles > inside quoted attribute values safely
Preserves <script>, <style>, <pre>, and <textarea> content verbatim
Inline short text blocks kept on one line (e.g. <h1>Title</h1>)
Correctly identifies void/self-closing elements like <br> and <img>
Handles DOCTYPE declarations, HTML comments, and CDATA sections
100% browser-based — safe for proprietary templates and internal tools

Frequently Asked Questions

Also Known As

html beautifier online freeformat html code onlinehtml code formatter browserpretty print html onlinebeautify html markup onlinehtml indenter online toolunminify html onlinehtml formatter no install