Transform minified or messy HTML into clean, readable format with proper indentation and structure. Perfect for debugging, code review, and learning from production websites. Also minify HTML to reduce file size for faster page loads.
Essential for web developers cleaning up code, designers inspecting websites, and anyone needing to understand HTML structure. All processing happens in your browser for complete privacy.
How to Use
Paste your HTML code in the textarea
Click "Format HTML" to beautify with proper indentation
Or click "Minify HTML" to compress for production
Click "Copy" to copy the formatted/minified HTML
Use in your projects or for learning purposes
Why Format HTML?
Formatted HTML is easier to read, debug, and maintain. When inspecting production websites or working with minified code, formatting reveals the structure, making it possible to understand the layout, identify issues, and learn from examples.
Common Use Cases
Debugging: Format minified production HTML to understand structure and find issues
Learning: Study well-designed websites by formatting their HTML
Code Review: Beautify code before reviewing to ensure readability
Optimization: Minify HTML to reduce file size and improve page load speed
Email Templates: Clean up email HTML for better compatibility
Features
Format minified HTML with proper indentation and line breaks
Minify HTML to reduce file size by removing whitespace
Preserve HTML structure and attributes
100% client-side processing - code never leaves your browser
No file size limits or usage restrictions
Instant results with one-click copy
Format vs Minify
Formatting (Beautify)
Adds proper indentation, line breaks, and spacing to make HTML readable. Use during development, debugging, and learning. Increases file size but improves maintainability and understanding.
Minification
Removes whitespace, line breaks, and comments to reduce file size. Use for production deployment to improve page load speed. Reduces file size by 10-30% but makes code unreadable.
HTML5 Semantic Elements
Modern HTML5 introduces semantic elements that provide meaning to your document structure. These elements improve accessibility, SEO, and code maintainability. Our formatter preserves semantic structure while ensuring proper indentation.
Key Semantic Elements:
<header>: Introductory content or navigation links for a page or section
<nav>: Navigation links for the website or page sections
<main>: Main content of the document, unique to the page
<article>: Self-contained content that could be distributed independently
<section>: Thematic grouping of content with a heading
<aside>: Content tangentially related to main content (sidebars)
<footer>: Footer information for a page or section
HTML Accessibility Best Practices
Accessible HTML ensures your website is usable by everyone, including people with disabilities. Search engines also favor accessible websites, improving your SEO rankings.
Essential Accessibility Features:
Alt Text: Always include descriptive alt attributes for images: <img src="photo.jpg" alt="Person hiking in mountains">
ARIA Labels: Use ARIA attributes for dynamic content and custom widgets
Heading Hierarchy: Use h1-h6 in proper order, don't skip levels
Form Labels: Every input needs an associated label element
Keyboard Navigation: Ensure all interactive elements are keyboard accessible
Color Contrast: Maintain WCAG AA contrast ratios (4.5:1 for text)
HTML Performance Optimization
Optimized HTML improves page load speed, user experience, and search engine rankings. While minification reduces file size for production, proper formatting during development is essential for debugging.
Performance Tips:
Minify for Production: Remove whitespace and comments to reduce file size by 20-30%
CSS in Head: Place stylesheets in <head> for faster rendering
JavaScript Before Close Body: Load scripts at end to prevent render blocking
Lazy Load Images: Use loading="lazy" attribute for below-fold images
Preload Critical Resources: Use <link rel="preload"> for fonts and critical CSS
Reduce DOM Depth: Avoid deeply nested elements (max 15 levels)
Common HTML Formatting Issues
Understanding common HTML problems helps you write cleaner, more maintainable code. Our formatter automatically fixes many of these issues.
Frequent Problems:
Inconsistent Indentation: Mix of tabs and spaces causes alignment issues. Use 2 or 4 spaces consistently.
Deprecated Tags: Avoid <font>, <center>, <marquee>. Use CSS instead.
HTML Email Templates
Email HTML requires special formatting due to limited CSS support in email clients. Formatting email HTML helps identify compatibility issues and maintain consistent rendering across clients.
Email HTML Considerations:
Use tables for layout (email clients don't support modern CSS)
Inline CSS styles instead of external stylesheets
Avoid JavaScript entirely (blocked by email clients)
Test in multiple email clients (Gmail, Outlook, Apple Mail)