CSS Minifier — Free Online
Strip comments and whitespace from CSS. Works in your browser, no install needed.
Free with a CeevTech Tools account — no credit card required.
How to use CSS Minifier
Paste your CSS into the input box.
Click Minify CSS.
Check the size saving and click Copy.
Why use CeevTech CSS Minifier?
Smaller stylesheets load faster, especially on mobile connections. CeevTech CSS Minifier removes comments, extra whitespace and trailing semicolons from your CSS and shows the size before and after, with the percentage saved. Paste your stylesheet, minify it and copy the compact result, all processed in your browser.
- Fast: processes your URL or code in seconds.
- Private: runs in your browser, so nothing is uploaded.
- Works everywhere: desktop, tablet and phone, in any modern browser.
- One account, 79+ tools: PDF, image, office, AI, developer and business tools in one place.
Frequently asked questions
Does it rename classes or merge rules?
No. It only strips comments and unnecessary whitespace and removes the last semicolon in each block. Your selectors and rules stay as written.
Should I keep my original file?
Yes. Keep the readable version for editing and test the minified output on your site. Spaces around + and > are removed, which can affect expressions such as calc(), so check those.
Is CSS Minifier free?
Free with a CeevTech Tools account — no credit card required.
Do I need to install anything?
No. CSS Minifier runs online in your browser on Windows, Mac, Linux, Android and iPhone.
Is my data private?
Yes. CSS Minifier runs entirely in your browser, so your data never leaves your device.