Format, beautify, minify, and validate HTML code with real-time error checking and accessibility warnings. Perfect for web developers.
beginnerDeveloper Tools
✨ Key Features
🎨 Smart Formatting
Beautify HTML with proper indentation and structure, or minify for production
✅ HTML Validation
Real-time validation with detailed error messages and accessibility warnings
📊 Performance Metrics
See file size reduction and optimization statistics for better performance
✅ Valid HTML
Your HTML structure looks good!
Input HTML
Formatted HTML
🌐 HTML Best Practices
📝 Semantic HTML
- • Use semantic elements (header, nav, main, article, section, footer)
- • Choose appropriate heading hierarchy (h1-h6)
- • Use lists (ul, ol) for grouped content
- • Add meaningful alt attributes to images
- • Use form labels and fieldsets properly
- • Include lang attribute on html element
♿ Accessibility
- • Provide alt text for all images
- • Use proper heading structure
- • Ensure sufficient color contrast
- • Add ARIA labels where needed
- • Make content keyboard navigable
⚡ Performance
- • Minify HTML for production
- • Remove unnecessary comments and whitespace
- • Optimize images and use appropriate formats
- • Minimize HTTP requests
- • Use efficient CSS and JavaScript loading
- • Implement proper caching strategies
🔍 SEO Optimization
- • Include proper DOCTYPE declaration
- • Use descriptive title and meta tags
- • Structure content with proper headings
- • Add Open Graph and Twitter Card meta tags
- • Implement structured data markup
🚨 Common HTML Issues to Avoid
- • ❌ Unclosed tags (missing closing tags)
- • ❌ Duplicate IDs (IDs must be unique)
- • ❌ Missing alt attributes on images
- • ❌ Improper nesting of elements
- • ❌ Missing DOCTYPE declaration
- • ❌ Using deprecated HTML elements
- • ❌ Inline styles instead of CSS classes
- • ❌ Missing viewport meta tag for mobile