How to Use This Tool
Paste your full stylesheet into the input box. Click "Minify" and the tool strips out comments, line breaks, and unnecessary whitespace, then shortens redundant syntax where it's safe to do so — without changing how a single rule renders. You'll see a before-and-after file size comparison so you know exactly how much smaller your CSS became, which is a real, measurable win for page load speed and Core Web Vitals scores like Largest Contentful Paint. Copy the minified output or download it directly as a .css file to drop into your production build. This is especially useful if you're hand-writing CSS without a build tool like Vite or Webpack, or if you need a one-off minified stylesheet for a static HTML page, email template, or CodePen demo.
Frequently Asked Questions
What does minifying CSS mean?
Minifying CSS involves stripping out unnecessary characters—such as spaces, line breaks, indentation, and comments—from the source code without altering its functionality.
Does minifying CSS improve website performance?
Yes. Minification reduces the file size, which results in faster download times, quicker page rendering, and improved overall SEO and user experience.
What is the difference between minification and Gzip compression?
Minification removes whitespace and comments from the actual source code file, whereas Gzip uses server-side algorithms to shrink the file payload before transferring it over the network.
How do I unminify CSS?
You can reverse minification using a CSS 'unminifier' or 'beautifier' tool, which restores standard indentation and formatting to make the code readable for debugging.
Should I minify CSS during development?
No, you should only serve minified CSS in your live production environment. Keep the unminified version during development to make editing and debugging easier.