CSS Minifier
Minify CSS to reduce file size
Enter CSS to minify
What is CSS Minification?
CSS minification is the process of removing unnecessary characters from CSS code without changing its functionality. This includes removing whitespace, line breaks, comments, and trailing semicolons to reduce file size and improve page load times.
How to Use
- Paste your CSS into the input field
- Click "Minify CSS" to compress your code
- Copy the minified result
Example
Input (formatted CSS):
/* Main styles */
body {
margin: 0;
padding: 0;
font-family: Arial, sans-serif;
}
.container {
max-width: 1200px;
margin: 0 auto;
}Output (minified CSS):
body{margin:0;padding:0;font-family:Arial,sans-serif}.container{max-width:1200px;margin:0 auto}Technical Notes
This tool removes CSS comments, collapses whitespace, removes trailing semicolons before closing braces, and eliminates unnecessary line breaks. For production use, consider using build tools like cssnano or clean-css for more advanced optimization options including property merging and shorthand conversion.
Privacy Notice
All CSS minification happens entirely in your browser. Your CSS code is never transmitted to any server, ensuring complete privacy for your stylesheets and design code.
Frequently Asked Questions
Why should I minify CSS?
Minifying CSS reduces file size, which leads to faster page load times and lower bandwidth usage. Smaller CSS files mean faster downloads, quicker parsing, and improved website performance scores. This is especially important for mobile users and can improve your website's Core Web Vitals and SEO rankings.
Will minification break my CSS?
No, minification only removes unnecessary whitespace, comments, and trailing semicolons. The CSS selectors, properties, and values remain unchanged. The minified CSS is functionally identical to the original and will produce the same visual results.
What optimizations does this tool perform?
This tool removes CSS comments, collapses whitespace around selectors and properties, removes trailing semicolons before closing braces, and eliminates unnecessary line breaks. It uses a lightweight regex-based approach for fast, client-side processing.
Are comments removed?
Yes, all CSS comments (/* ... */) are removed during minification to reduce file size. If you need to preserve specific comments (like copyright notices), you'll need to add them back after minification or use advanced tools that support comment preservation.
Is my CSS sent to a server?
No, all CSS minification happens in your browser. Your code never leaves your device, ensuring complete privacy for your stylesheets, design code, and any proprietary CSS.