Code Tower · room 28
CSS Minifier
Minify and optimize CSS.
🔒 Processed in your browser · No upload · No sign-up
Minify CSS online
Paste CSS to remove whitespace and comments, shorten colors (#ffffff → #fff), merge duplicate rules and drop redundant declarations. Minification uses Lightning CSS, a fast Rust-based CSS engine compiled to WebAssembly, running entirely in your browser.
What does "browser support" do?
Lightning CSS can also lower modern syntax for older browsers — for example adding vendor prefixes or converting nested CSS — based on the targets you choose. Pick "Don't transform syntax" to only minify.
Will it break my styles?
No. All optimizations are safe and spec-compliant; the output renders identically. Invalid CSS is reported with the line and column so you can fix it.