Optimize your stylesheets with our professional CSS Minifier Online. Instantly remove whitespace, comments, and extra characters to shrink CSS file size and boost your website's performance.
In the world of web development, every kilobyte counts. Large, unoptimized CSS files can significantly delay your website's First Contentful Paint (FCP), leading to a poor user experience and lower SEO rankings. Our CSS Minifier is a lightweight, browser-based tool designed to strip away the "fluff" from your stylesheets, leaving only the essential code required for the browser to render your design.
When you write CSS, you use spaces, tabs, and comments to make the code readable for humans. However, browsers don't need any of that. A CSS optimizer scans your code and removes these unnecessary elements. It also handles minor optimizations like removing the final semicolon in a block or stripping spaces around colons and braces. The result is a much smaller file that downloads faster and parses more efficiently.
If you are also working with other web languages, you might find our HTML Tag Stripper or Pixels to REM Converter useful for further refining your front-end workflow.
We recommend keeping a "source" version of your CSS for development (with all the comments and formatting) and using this CSS shrinker to generate a "production" version. This ensures you can still easily edit your code while providing the fastest possible experience for your end-users. If you're building complex layouts, consider using our CSS Gradient Generator to create optimized background code before minifying it here.
Actually, it's slightly easier! Browsers ignore whitespace and comments anyway. By removing them beforehand, the browser has fewer characters to process, which can lead to marginally faster parsing times.
While you can use a "CSS Unminifier" or "Beautifier" to add back indentation and line breaks, any comments removed during minification are lost forever. This is why you should always keep a backup of your original source code.
Yes. Our minifier is designed to handle modern CSS3 syntax, including variables (custom properties), media queries, and advanced selectors, without corrupting the code logic.