CSS Minifier

Minify CSS by removing whitespace, comments, and redundant code to reduce file size.

Loading...
1. Paste your CSS source code into the input text area. 2. The minifier instantly processes the CSS and displays the compressed output below. 3. Review the file size comparison showing original size, minified size, and compression percentage. 4. Verify the minified output preserves all your CSS rules and selectors. 5. Click the copy button to copy the minified CSS for use in your production stylesheet.

About This Tool

The CSS Minifier compresses your stylesheets by stripping unnecessary whitespace, removing comments, shortening color values, and eliminating redundant semicolons and units. Paste your CSS and instantly get a minified version with a clear display of the bytes saved and compression ratio.

Minification is a crucial step in web performance optimization. Every byte saved in CSS reduces page load time, decreases bandwidth consumption, and improves Core Web Vitals scores. While build tools like PostCSS and cssnano handle this automatically in production pipelines, this online tool is perfect for quick one-off minification tasks.

The tool preserves the functional correctness of your CSS while applying safe optimizations. It handles modern CSS features including custom properties, grid and flexbox shorthand, media queries, keyframe animations, and nested selectors. A before-and-after size comparison shows exactly how much space was saved.

Frequently Asked Questions

Minification removes all characters that are not necessary for the CSS to function - whitespace, line breaks, comments, and trailing semicolons. It may also shorten color codes (e.g., #ffffff to #fff) and remove redundant units (e.g., 0px to 0).
No. Minification only removes characters that have no functional impact. The minified CSS will render identically to the original in all browsers. However, it becomes much harder for humans to read.
Typical savings range from 15% to 40% depending on how the original CSS is formatted. Heavily commented and well-formatted CSS with lots of whitespace will see the greatest reductions.
Yes. Minified CSS loads faster, reduces bandwidth costs, and improves page performance scores. Most build tools do this automatically, but this online tool is useful for quick tasks or projects without a build pipeline.
You cannot restore the original formatting exactly, as comments and specific whitespace choices are lost. However, you can use a CSS beautifier or formatter to add consistent indentation back to minified code.

Related Tools

JavaScript Minifier

Minify JavaScript by removing whitespace, comments, and shortening variable names for smaller files.

Developer Tools

HTML Minifier

Minify HTML by removing whitespace, comments, and optional tags to reduce document size.

Developer Tools

HTML Entity Encode and Decode

Convert special characters to HTML entities and decode HTML entities back to readable text.

Developer Tools

JSON Formatter and Validator

Format, validate, and beautify JSON data with syntax highlighting, tree view, and error detection.

Developer Tools

JSON Minifier

Minify JSON by removing whitespace and formatting for compact, production-ready output.

Developer Tools