CSS Minifier

What the CSS Minifier does

The CSS Minifier strips whitespace, comments, and unnecessary characters from CSS code to reduce its file size for production, without changing how the styles behave.

How to use it

1. Paste your CSS into the box.
2. Click Minify CSS.
3. Click Copy minified CSS to copy the compressed output.

Common uses

• Reducing a stylesheet's file size before deploying it to production.
• Preparing CSS for a performance audit that penalizes unminified assets.
• Compressing a CSS snippet before embedding it inline in an email or widget.
• Cleaning up CSS pulled from a browser's dev tools for reuse elsewhere.
• Comparing the size difference between formatted and minified CSS for a report.

Good to know

Minification only removes redundant characters — it doesn't restructure or optimize the actual rules, so a bloated stylesheet with duplicate or unused rules will still be bloated after minifying, just smaller. Always keep an unminified source copy of your CSS for future edits; minified output is meant for production delivery, not ongoing development.

The gap between formatted and minified CSS file size is usually smaller than people expect on modern connections, especially once gzip or Brotli compression (which most servers apply automatically) is factored in — compression already removes much of the redundancy that manual minification targets. Minification still helps, particularly for render-blocking stylesheets loaded before compression kicks in on the very first byte, but it's one optimization among several rather than a single silver bullet for page speed.