About CSS Formatter / Minifier
Use Prettier for readable CSS and CSSO for minification with optional structural optimization.
CSS Formatter / Minifier uses Prettier to produce consistent readable CSS and CSSO to remove redundancy. Structural optimization can be disabled for a more conservative minification pass.
How to use it
- Paste standard CSS and choose formatting options.
- Format it or minify with the desired optimization level.
- Test the output in its real page before deployment.
Common use cases
- Format a compact stylesheet for code review.
- Reduce CSS before embedding it in a static page.
- Detect parser errors while preparing a stylesheet for deployment.
Worked example
Turn a one-line component stylesheet into reviewable CSS, then compare its optimized size.
Limitations and responsible use
- Structural optimization may combine or reorder compatible rules and can expose dependencies on CSS hacks.
- The tool processes standard CSS, not Sass, Less, or build-tool-specific syntax.
- Visual correctness still requires testing the resulting stylesheet in its actual document.
Frequently asked questions
What does structural optimization do?
It allows CSSO to restructure compatible rules for a smaller result. Disable it when preserving rule shape is more important.
Does minification guarantee the page looks identical?
No. Parser-safe output should still be tested against the real HTML and supported browsers.