Minify CSS Online
CSS minification removes whitespace, comments, and unnecessary characters without changing how the stylesheet behaves. For large stylesheets, savings of 20—40% are typical.
What minification removes
- Whitespace and line breaks (tabs, spaces, newlines)
- CSS comments (/* ... */)
- Redundant semicolons before closing braces
- Shorthand property optimisations
When to minify
- Production deployments — never serve un-minified CSS to users
- Performance audits (Google PageSpeed flags large CSS files)
- Before bundling — many build tools (Webpack, Vite) minify automatically
- Manual projects without a build step
Frequently Asked Questions
Will minifying break my CSS?
No — minification only removes non-functional characters. Browser parses the result identically.
Should I minify CSS manually or use a build tool?
Use a build tool (Vite, Webpack, Parcel) for real projects. Irreva is handy for one-off files or legacy projects.