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Beautified CSS
About This Tool
CSS Beautifier & Minifier is a comprehensive tool for formatting and optimizing CSS code. Whether you're debugging vendor CSS, optimizing stylesheets for production, or maintaining a large codebase, clean and properly formatted CSS is essential for readability and performance. This tool instantly beautifies compressed CSS into readable format with proper indentation, or minifies development CSS to reduce file size for faster page loads. Advanced features include property sorting (alphabetical organization for consistency), color optimization (shortening hex codes like #ffffff to #fff), media query sorting (organizing breakpoints from smallest to largest), and syntax validation to catch missing braces or semicolons. All processing happens client-side in your browser—no CSS is uploaded to any server, making it safe for production stylesheets and client projects.
How to Use
- Paste or type your CSS into the input panel
- Select mode: Choose Beautify to format minified/messy CSS with proper indentation (2 spaces, 4 spaces, or tab), or Minify to compress for production
- Real-time validation: The tool highlights syntax errors (unclosed braces, missing semicolons, invalid properties)
- Advanced Options:
- Sort Properties: Alphabetically organize CSS properties within each rule (improves Git diff readability)
- Color Optimization: Shorten color codes (#ffffff → #fff, rgb(255,0,0) → #f00)
- Sort Media Queries: Reorder @media queries from smallest to largest breakpoint
- Compression Level: Normal (safe) or Aggressive (maximum compression)
- Preserve Comments: Keep or remove code comments
- Works with CSS3, vendor prefixes, CSS variables, nested selectors, and @supports/@media rules
Common Use Cases
- Production Optimization: Minify your site's main.css from 150KB to 110KB—every kilobyte saved improves page load time, especially on mobile networks
- Debugging Vendor CSS: Beautify minified Bootstrap or Tailwind output to understand what styles are being applied and find conflicts
- Code Review: Before committing CSS changes, beautify and sort properties alphabetically so Git diffs show only meaningful changes, not formatting differences
- Legacy Code Maintenance: Inherited a project with inconsistent CSS formatting? Beautify all files with consistent indentation to improve readability
- Learning CSS: Students can paste complex CSS examples and beautify them to understand structure, specificity, and cascade rules
- CSS Variable Management: Organize :root variables alphabetically for easier maintenance in design systems
Limitations & Important Notes
- Does NOT support:
- CSS preprocessors (SCSS, SASS, LESS, Stylus)—compile them first
- CSS-in-JS syntax (styled-components, emotion)
- PostCSS plugins that extend syntax
- Performance: Very large stylesheets (>5MB) may cause browser slowdown—use command-line tools like csso or clean-css for batch processing
- Edge cases requiring review:
- CSS hacks (IE-specific filters)
- Intentional whitespace in content properties
- Very old proprietary properties may cause warnings
- Property sorting: Purely alphabetical—doesn't optimize for CSS specificity or cascade order
- Media query sorting: Assumes min-width breakpoints; complex queries with max-width/orientation may not sort as expected
- Important: Always test minified CSS thoroughly in production—automation can't catch all edge cases