Reduce your CSS file size and improve website performance with our free online CSS minifier. Remove unnecessary whitespace, comments, and formatting to optimize your stylesheets for production and ensure faster load times for your users.
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Tip
Always test your minified CSS in a staging environment before deploying to production.
Did You Know?
CSS minification can reduce style sheet size by up to 20% or more depending on original formatting.
CSS (Cascading Style Sheets) is the stylesheet language used to describe the presentation of a document written in HTML. It controls the layout, colors, fonts, and overall visual appearance of a website. While human-readable formatting is essential during development, browsers only require the raw code logic. Minification bridges this gap by converting developer-friendly styles into high-performance production assets.
Best Practice
Combine multiple CSS files into one and then minify to reduce the number of HTTP requests.
cssnano or esbuild for automatic minification.clean-css-cli to automate the compression process within your local terminal.Q: Will minifying CSS break my site's layout? A: No, minification only removes non-functional characters like whitespace and comments without altering the actual styling logic.
Q: Should I keep my original CSS files? A: Yes! You should always keep your unminified source code for development and only serve the minified version to users.
Q: Does this tool support CSS3 features? A: Yes, the minifier supports modern CSS3 syntax including variables, grid, and flexbox properties.
Q: What is the difference between minification and Gzip? A: Minification removes source code characters, while Gzip is a server-side compression that shrinks the file further during transmission.