The CSS Minifier is a powerful optimization tool that reduces the file size of your Cascading Style Sheets by removing unnecessary characters, whitespace, comments, and redundant code while preserving functionality. CSS minification is crucial for improving website performance, reducing page load times, and decreasing bandwidth usage—all of which contribute to better user experience and improved SEO rankings. Our tool intelligently strips out all non-essential content including multi-line comments, single-line comments, excess whitespace between selectors and properties, unnecessary line breaks, and redundant semicolons, while keeping your styles perfectly functional. The minifier also offers a beautify function that reverses the process, adding back whitespace and indentation to make minified CSS human-readable again for debugging or editing purposes. This is particularly useful when working with third-party stylesheets or legacy code where the original source has been lost. All processing happens entirely within your browser using client-side JavaScript, ensuring your CSS code remains private and never leaves your device. The tool preserves all CSS features including media queries, keyframe animations, CSS Grid and Flexbox properties, CSS custom properties (variables), vendor prefixes, calc() functions, and complex selectors. Use this tool before deploying stylesheets to production, optimizing CSS for Content Delivery Networks (CDNs), reducing file sizes for faster mobile experiences, or preparing CSS for inline embedding in HTML documents.
Frequently Asked Questions
Will this break my CSS?
It shouldn't, but it removes comments and extra spaces. It is always good practice to test your minified code.
Can I reverse the minification?
Yes, use the "Beautify" button to make it readable again, though original comments will be lost forever.
Does it support CSS variables?
Yes, it treats CSS variables just like any other property and preserves them.
How much does minification reduce file size?
CSS minification typically reduces file size by 15-40%, depending on how much whitespace, comments, and formatting your original CSS contains. Well-commented, properly formatted CSS sees the most reduction.
Does it remove unused CSS?
No, this tool only removes whitespace and comments. It doesn't analyze your HTML to detect unused selectors. For that, you'd need a more advanced tool like PurgeCSS or UnCSS.
Will it mess up my media queries?
No, media queries are preserved perfectly. The minifier only removes whitespace and comments, not functional CSS code.