CSS Minifier & Beautifier
Minify CSS to reduce file size or beautify compressed CSS for readability. Shows original size, minified size, and savings percentage.
About CSS Minifier & Beautifier
The CSS Minifier and Beautifier is a free browser-based tool that helps front-end developers optimize and format their stylesheets. Paste any CSS into the input area and choose to either minify it for production or beautify it for development readability.
The minifier removes all comments, unnecessary whitespace, newlines, and trailing semicolons from your CSS. The result is a compact, single-line stylesheet that loads faster and reduces bandwidth usage. This is especially useful when you need to quickly minify CSS without setting up a build tool or when working with inline styles.
The beautifier does the opposite: it takes compressed or poorly formatted CSS and reformats it with consistent indentation, one declaration per line, and proper spacing around selectors and braces. This makes minified CSS readable again, which is invaluable when debugging production stylesheets or reviewing third-party code.
After each operation, the tool displays the original size, output size, and the percentage of savings or increase. This gives you immediate feedback on how much space you are saving through minification or how much the beautified output grows compared to the compressed input.
Everything runs in your browser with no server-side processing. Your CSS never leaves your machine, so you can safely work with proprietary stylesheets, design system tokens, or any sensitive code. Simply paste, click, and copy the result.
Frequently Asked Questions
What does CSS minification remove?
CSS minification removes all comments, extra whitespace, newlines, and the last semicolon before a closing brace. It also collapses multiple spaces into one and removes spaces around selectors and properties where they are not needed. The resulting CSS is functionally identical but significantly smaller in file size.
How much space can minification save?
Typical savings range from 15% to 40% depending on the original formatting style and the amount of comments in the source CSS. Well-commented and heavily indented stylesheets see the largest reductions. The tool displays the exact byte counts and savings percentage after each operation.
Does the beautifier restore my original formatting?
The beautifier applies a consistent, standard formatting style with one rule per line and proper indentation. It will not recreate your original formatting choices such as specific comment placement or blank line patterns, but the output is clean, readable, and follows common conventions.
Is my CSS sent to a server for processing?
No. All minification and beautification happens entirely in your browser using JavaScript. Your stylesheets are never uploaded or transmitted anywhere, making this tool safe for use with proprietary or sensitive CSS code.