CSS Minifier & Beautifier
Minify CSS to cut file size, or beautify it to read it clearly. Comments and whitespace go; url() values and quoted content stay intact.
100% free. Runs entirely in your browser - your files and data never leave your device and nothing is uploaded to any server.
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About this tool
Minify or beautify: CSS (stripping whitespace and comments to make the smallest possible file for production) or beautifies it (adding proper indentation and line breaks to make dense/minified CSS readable again) - covering both directions of the same underlying formatting problem.
How to use this tool
- Paste CSS sourceAdd your stylesheet content into the input editor.
- Select minify or beautifyChoose compact production output or readable formatted output.
- Run conversionProcess the CSS and inspect the generated result instantly.
- Copy and replaceUse output in your build pipeline or debugging workflow.
Minify or beautify CSS
Minify for production: removing whitespace, comments and unnecessary semicolons makes stylesheets smaller and faster to download, with no change to how the page looks. Beautify for reading: it restores one rule per line and consistent indentation, so you can inspect a minified stylesheet from a live site.
In a real project, let your build tool minify CSS automatically so your source files stay readable.
Key features
- Reduces CSS payload size for faster page load performance.
- Beautifies unreadable minified files for easier debugging.
- Runs in-browser with immediate copy-ready output.
- Simple workflow for both optimization and reverse-formatting needs.
Common uses
- Preparing CSS for production deployment.
- Inspecting third-party minified stylesheets.
- Cleaning merged styles before code review.
- Quick formatting for snippets shared in team chats.
Tips for better results
- Minify only final production assets; keep source files readable in version control.
- Run visual regression checks after major CSS optimization changes.
- Preserve source maps in your build process for easier debugging.
- Group related selectors before minification for maintainable source structure.
Mistakes to avoid
- Editing minified files directly instead of source CSS.
- Assuming every minification issue is a tool bug when source CSS is invalid.
- Skipping browser checks after large stylesheet refactors.
- Mixing compressed and uncompressed versions in deployment bundles.
Frequently asked questions
No - minifying only removes whitespace, comments, and unnecessary characters. The actual styling rules and their effect on a page are completely unchanged.
Minified CSS (all on one line) is unreadable for humans - beautifying it is useful when you need to inspect, debug, or learn from someone else's minified stylesheet.
It varies by how much whitespace/comments the original had, but minifying typically shaves off a meaningful percentage of file size, which helps pages load faster, especially at scale across many visitors.
For a live site, minify in your build pipeline so the readable source stays in your repository. This page is useful for one-off files, snippets for email templates or CMS fields, and checking how much a stylesheet would shrink.
No, they add up. Compression removes repetition, minifying removes characters gzip cannot - comments and whitespace - so a minified file still compresses smaller than an unminified one.
No. Minifying shrinks the code you have; removing unused selectors needs a tool that scans your pages, such as PurgeCSS, or the Coverage panel in Chrome DevTools.