📖 What is HTML Beautifier?
An HTML beautifier (also called a formatter or pretty-printer) takes messy, minified or single-line HTML and reformats it with proper indentation, line breaks and consistent spacing. It makes HTML readable without changing how it renders in the browser.
Use it to clean up HTML from view-source, CMS output, API responses, email templates or any source where formatting was stripped. Paste your HTML and get the formatted result instantly. Everything runs in your browser — your HTML is never uploaded.
💡 Example
Input
<div><ul><li>Item 1</li><li>Item 2</li></ul></div>
Output
<div>
<ul>
<li>Item 1</li>
<li>Item 2</li>
</ul>
</div>
🛠️ Common Use Cases
- Formatting minified HTML from production websites for debugging
- Cleaning up HTML copied from browser view-source or DevTools
- Making CMS-generated HTML readable for editing
- Formatting HTML email template code for review
- Pretty-printing API responses that return HTML content
📝 What the Beautifier Does
- Indentation — adds consistent 2-space or 4-space indentation based on nesting depth
- Line breaks — places each element on its own line for readability
- Attribute formatting — optionally wraps long attribute lists across multiple lines
- Self-closing tags — normalizes
<br> vs <br/> based on HTML5 conventions
The output is functionally identical to the input — only whitespace changes. The browser renders it exactly the same way.
⚠️ Common Mistakes
- Beautifying for production — formatted HTML is larger. Serve minified HTML in production and use the beautifier only for development and debugging.
- Assuming beautified HTML is valid — the beautifier formats what you give it. If the original HTML has unclosed tags or invalid nesting, the output will be consistently indented but still invalid.
- Formatting inside
<pre> blocks — whitespace inside <pre> is significant. Good beautifiers preserve it, but always check.
- Reformatting generated code — if your framework generates HTML (React, Vue, Angular), beautify the template source, not the rendered output.
❓ Frequently Asked Questions
Does beautifying change how the HTML renders? ▾
No — only whitespace is added or modified. The browser ignores extra whitespace between tags, so the visual output is identical. The only exception is content inside pre or textarea tags, where whitespace is significant.
Can I use this to fix broken HTML? ▾
The beautifier formats HTML but does not repair it. Unclosed tags, invalid nesting or missing attributes will be indented consistently but not corrected. Use an HTML validator to find and fix structural issues.
What indentation size does it use? ▾
The default is 2 spaces per indent level. Some beautifiers offer 4 spaces or tabs as alternatives. Two spaces is the most common convention for HTML.
Is my data private? ▾
Yes — all processing runs entirely in your browser using JavaScript. Your data is never sent to any server.
Is this tool free? ▾
Completely free — no login, no usage limits, and it works offline once the page is loaded.
Yes — completely free, no login required, no usage limits.
Is my data private? ▾
Yes — all processing runs in your browser. Your data is never sent to any server.
Does it work offline? ▾
Yes — once the page is loaded, the tool works without an internet connection.