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HTML Beautifier

Format and indent HTML code online for better readability. Free HTML beautifier with syntax highlighting and auto-indentation.

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About HTML Beautifier

This free online HTML Beautifier formats your HTML code with proper indentation and line breaks, making it easier to read and debug. Perfect for web developers working with minified HTML, code generated by frameworks, or messy markup. All processing happens in your browser - your code never leaves your device.

How to Use HTML Beautifier

1

Paste your HTML

Paste minified or messy HTML into the input editor on the left, or click Upload to pick an .html file from disk. The beautifier accepts full documents, partial fragments, or snippets equally well.

2

Choose indentation

Select 2-space, 4-space, or tab indentation from the controls. 2 spaces matches Prettier and most modern style guides; 4 spaces or tab is common in older codebases.

3

View beautified output

The properly indented HTML appears instantly in the output panel with syntax highlighting. Nested elements are indented consistently at every depth, making the structure obvious.

4

Copy or download

Click Copy to put the beautified HTML on your clipboard, or Download to save it as an .html file. Use it in email templates, documentation, code reviews, or anywhere readable HTML is needed.

When to Use HTML Beautifier

Debugging minified production HTML

When inspecting a deployed website's source (View Source / Save Page As), you typically see compressed HTML on a single line — impossible to read. Paste it here for instant beautification, then trace component structures, find specific elements, or extract template fragments for analysis or documentation.

Reviewing email templates and CMS output

Email service providers (SendGrid, Mailchimp), CMSes (WordPress, Drupal), and template engines often output dense, table-heavy HTML for cross-client compatibility. Beautify these to audit accessibility (alt text, semantic structure), spot inline-style bloat, or hand-tune templates without losing your sanity.

Preparing HTML for documentation

Code blocks in technical documentation (Stack Overflow answers, blog posts, READMEs, design system docs) are vastly more useful when properly indented. Beautify before pasting so readers can quickly scan structures. 2-space indent works best in narrow doc layouts; 4-space for spacious presentations.

Cleaning up generated HTML

HTML produced by builders (Webflow, Wix), AI assistants, headless CMSes, or web scrapers often has inconsistent whitespace. Beautifying produces clean, ready-to-edit markup — useful when migrating exported content into your own templates or version-controlled component libraries.

HTML Beautifier Examples

Minified HTML to readable

Input
<div class="card"><h2>Title</h2><p>Body text with <a href="/x">link</a>.</p></div>
Output
<div class="card">
  <h2>Title</h2>
  <p>Body text with <a href="/x">link</a>.</p>
</div>

A single-line HTML fragment becomes a clearly nested 4-line structure. Each child element is indented one level under its parent (2 spaces), making the parent-child relationships immediately obvious. Inline elements like <a> stay on the same line as surrounding text — beautifying targets block structure, not inline content.

Form structure made readable

Input
<form><label>Name<input name="n"/></label><label>Email<input type="email"/></label><button>Submit</button></form>
Output
<form>
  <label>Name<input name="n"/></label>
  <label>Email<input type="email"/></label>
  <button>Submit</button>
</form>

Form elements are reformatted with each <label> and <button> on its own line. Note how <input> stays inline within <label> — preserving the original block-vs-inline relationships. This is essential for accessibility audits where you need to verify each input has an associated label.

Preserving <pre> content

Input
<div><pre>  preserved\n    indentation\n  inside</pre></div>
Output
<div>
  <pre>  preserved
    indentation
  inside</pre>
</div>

Content inside <pre> is preserved exactly — no extra indentation is added inside the <pre> tags, because that would corrupt the rendered preformatted text. This same behavior applies to <textarea>, <script>, <style>, and <code> blocks. Only the surrounding HTML is reformatted.

Tips & Best Practices for HTML Beautifier

  • 1.Use 2-space indent for HTML embedded in code (matches Prettier defaults and common style guides). Use 4-space when HTML appears in print or wide-screen documentation where readability is more important than line length.
  • 2.Beautify before code review. Reviewing minified HTML hides bugs; beautified HTML makes structural mistakes (missing wrappers, unclosed tags, incorrect nesting) immediately visible to reviewers.
  • 3.When debugging accessibility issues, beautify the rendered HTML (right-click → Inspect → Copy outerHTML in DevTools, then paste here). The indented structure makes it easy to see whether headings nest correctly, whether each form input has a label, and whether ARIA roles are applied to the right elements.
  • 4.If your HTML contains template syntax ({{ }}, <% %>, {% %}), beautify only the rendered HTML, not the template. The beautifier treats template tags as text and may move them in ways that break template logic.
  • 5.Watch for collapsed comments. The beautifier preserves <!-- comments --> but they don't affect indentation — long comments may end up on a single very long line. Manually wrap long comments before beautifying for best readability.
  • 6.For CSS-in-HTML (large <style> blocks), the beautifier preserves the CSS as-is. To also beautify the CSS, copy the contents of the <style> block to a separate CSS Beautifier tool, then paste the result back.

Frequently Asked Questions

An HTML Beautifier (also called an HTML formatter or pretty-printer) takes minified, compressed, or messy HTML and reformats it with proper indentation, consistent line breaks, and aligned nesting. The result is human-readable HTML that's easy to inspect, debug, and modify. It preserves all attributes, content, and behavior — only whitespace changes.

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