CSS Minifier

Minify CSS by removing comments, spaces and reducing file size

What is it and how does it work?

A CSS minifier strips everything a browser does not need from a stylesheet — comments, line breaks, indentation and the spaces around braces, colons and semicolons — leaving compact CSS that renders identically but downloads faster. A stylesheet you write is spaced out for humans to read and maintain, but every one of those characters is bytes the browser must fetch before it can paint the page. Since CSS blocks rendering, a smaller file means the page starts displaying sooner.

Minification is lossless in effect: the rules, selectors and values are untouched, so the page looks exactly the same — only the formatting that browsers ignore is gone. That makes it a standard production step: you keep a readable, commented source for development and ship the minified version to users. This tool minifies in your browser and pairs with a formatter when you need to expand minified CSS back into something editable, so nothing about your styles ever leaves your device.

Common use cases

• Speeding up a site: minify your stylesheet before deploying so the CSS downloads faster and the page renders sooner.
• Inlining critical CSS: compress a small block of above-the-fold styles to embed directly in the page head.
• Cleaning up a handoff: minify a stylesheet to ship while keeping your commented, formatted source for editing.

Frequently asked questions

Does minifying change how my styles look?

No. It removes only characters the browser ignores — whitespace and comments — so every rule, selector and value is preserved and the page renders identically. The effect is purely smaller file size, not different styling.

Can I edit minified CSS later?

Minified CSS is hard to read but still valid, so you can run it through a CSS formatter to restore indentation and line breaks for editing. The best practice is to keep your original formatted source and only minify the version you deploy.

How is this different from gzip?

They complement each other. Minifying removes redundant characters from the CSS text itself; the server then gzip-compresses the bytes during transfer. Minified CSS also compresses a little better, and it helps even where gzip is not configured.

Are comments removed?

Yes. Comments are for developers and add nothing for the browser, so minification strips them. Keep them in your source file; they simply do not need to travel to the user in the production stylesheet.

Developer

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