HTML Formatter & Beautifier
Free, browser-based HTML formatter, beautifier, and minifier. Clean, indent, and organize raw or minified HTML markup with live sandbox preview, DOM element metrics, and customizable indentation rules. All processing runs 100% locally in your browser for maximum security and privacy.
Input HTML
Click "Format" or "Minify" to see beautified HTML.
About HTML Formatter & Beautifier
Free, browser-based HTML formatter, beautifier, and minifier. Clean, indent, and organize raw or minified HTML markup with live sandbox preview, DOM element metrics, and customizable indentation rules. All processing runs 100% locally in your browser for maximum security and privacy.
What is HTML Formatter?
HTML Formatter & Beautifier is an essential developer utility designed to clean up messy, minified, or disorganized HTML markup. It automatically arranges tags with consistent indentation, properly nests child elements, aligns attributes, and formats embedded CSS (<style>) and JavaScript (<script>) code blocks. With built-in Live Preview, you can instantly inspect how the formatted markup renders in real time.
Key Features
- Instant Code Beautification: Automatically format HTML with 2 spaces, 4 spaces, or Tabs.
- Embedded Code Formatting: Formats inline <style> (CSS) and <script> (JavaScript) blocks automatically.
- High-Speed HTML Minifier: Strip comments and compress excess whitespace to optimize website loading speeds.
- Live Sandbox Preview: Switch to the Live Preview tab to inspect your web layout safely inside a sandbox iframe.
- Code Metrics & Insights: Track line count, character count, total DOM elements, scripts, and compression ratio.
- 100% Client-Side Privacy: No data is sent to any server; everything executes directly in your browser.
- 1-Click Copy & Download: Quick export to clipboard or as a clean .html file.
Common Use Cases
- Web Development: Clean up generated or bundled HTML templates before committing.
- Code Reviews: Un-minify production HTML markup to debug layout and DOM hierarchy issues.
- Email Template Design: Format and inspect responsive HTML newsletter markup with live preview.
- SEO & Performance Optimization: Minify HTML assets to reduce payload size and improve Core Web Vitals.
- Learning & Education: Inspect clean HTML document structures and standard semantic nesting.
How to Use This Tool
- Paste your HTML markup into the input editor or click "Sample" to load demonstration code.
- Select your preferred indentation (2 spaces, 4 spaces, or tabs) and line wrapping options.
- Click "Format" to beautify the code, or click "Minify" to strip comments and shrink file size.
- Click the "Live Preview" tab on the right to visually inspect how your HTML renders.
- Copy the output with one click or click "Download" to save the file locally.
Frequently Asked Questions
Is my HTML code sent to a remote server?
No. Utilbox executes all HTML formatting, minification, and rendering directly in your browser using client-side JavaScript. Your code never leaves your device.
Does the formatter handle inline CSS and JavaScript?
Yes. The formatter intelligently detects and beautifies any code inside <style> and <script> tags with appropriate indentation matching the surrounding HTML elements.
How does the Live Preview tab work?
The Live Preview tab renders your HTML within a secure sandboxed iframe, letting you check visual layout, headings, paragraphs, and styles immediately without opening a separate browser window.
Can this tool minify HTML for production use?
Yes. The Minify button collapses redundant whitespace and strips HTML comments while safely preserving sensitive tags like <pre>, <code>, and <textarea>.