About this tool
The CSS Minifier removes comments, unnecessary whitespace and line breaks from your stylesheet to make it as small as possible, which speeds up page loads and improves Core Web Vitals. Paste your CSS, minify it, and copy the compact result. It also reports how many bytes you saved.
How to use
- 1Paste your CSS code.
- 2Click Minify.
- 3Copy the compressed CSS.
Benefits
- Smaller files, faster pages.
- Shows bytes saved.
- Runs instantly in your browser.
Minify a tested build artifact, not your only source copy
Practical example
Removing comments and redundant whitespace can reduce a stylesheet transfer without changing normal rendering. A build pipeline should retain readable source and source maps for maintenance.
Interpreting the result
Compare file sizes, run visual regression checks and test modern syntax after minification. Serve the result with compression and long-lived caching when the filename is content-hashed.
Limits and common mistakes
A lightweight minifier cannot replace a standards-aware production pipeline for every CSS feature. Malformed input, legacy hacks and comments used by licenses or tools may require preservation.
Detailed guides for this tool
Learn the underlying concepts, worked examples and common mistakes before relying on the result.
Frequently asked questions
Will minifying break my CSS?+
No. It only removes comments and redundant whitespace, keeping the styles functionally identical.
Should I keep an unminified copy?+
Yes. Keep your original readable CSS for editing and minify only for production.