CSS Minifier
Compress CSS stylesheets for production.
About this tool
The CSS Minifier strips comments, whitespace, and redundant characters from stylesheets, producing a compact CSS file that browsers download and parse faster. Smaller CSS files directly improve page load performance.
How it works
- Paste your CSS into the input field.
- Click Minify to compress it.
- Review the output and the percentage reduction shown.
- Copy the minified CSS and replace the original file in your project.
Example use cases
- Production stylesheet: A 30 KB development stylesheet minified to 18 KB reduces the render-blocking resource that browsers must download before painting the page.
- Inline styles: Minify a block of inline CSS styles in an HTML email to reduce the overall email size for better deliverability.
Frequently asked questions
Does minification affect how my styles look in the browser?
No - minification only removes characters that are invisible to the CSS parser (whitespace, comments). All styling rules remain identical.
Should I minify CSS manually or use a build tool?
For ongoing projects, use a build tool (Webpack, Vite, Parcel) that minifies automatically on each build. This tool is ideal for one-off files or projects without a build pipeline.