CSS Minifier – Compress CSS Code Online

CSS minifier – Free Online Tool

Our free CSS Minifier compresses stylesheets by stripping comments, spaces and line breaks. Paste your CSS and get a smaller file that loads faster.

What is CSS minifier?

CSS minification removes everything the browser does not need to apply styles. The result is a single compact block of code that behaves exactly like the original.

CSS is render-blocking: the browser waits for it before showing the page. Smaller CSS means faster first paint and better page speed scores.

How to use the CSS minifier

1. Paste your CSS code.
2. Click minify.
3. Copy the compressed CSS.
4. Save it as your production stylesheet, such as style.min.css.

Key features

• Removes comments, whitespace and line breaks
• Preserves styling exactly
• Instant results
• Free and browser-based

Common use cases

• Optimising WordPress or Shopify theme CSS
• Improving Google PageSpeed Insights scores
• Reducing bandwidth on busy websites
• Preparing CSS for production builds

Frequently asked questions

How much smaller will my CSS be?

Typically 20–40%, depending on how many comments and spaces the original contains.

Can I edit minified CSS?

It is hard to read. Keep the original file for editing and minify again after changes.

Is minified CSS the same as compressed CSS?

Minification removes characters; server compression such as Gzip or Brotli shrinks the file further. Use both.

Related free tools

• HTML minifier
• JS minifier
• Color converter
• Color picker
• Brotli Checker