Format and beautify CSS stylesheets. Convert compressed or minified CSS to readable format.
This free online CSS beautifier and formatter uses the js-beautify library to expand minified or compressed CSS into neatly spaced, properly indented stylesheets that are easy to read and maintain. Whether you are reverse-engineering a third-party stylesheet, editing a downloaded theme, or just want to clean up your own code before a commit, this tool handles it instantly in your browser without any server upload.
The CSS Beautifier uses the css_beautify function from the js-beautify library to parse your stylesheet and reformat it with 2-space indentation, one declaration per line, and a blank line between rule blocks. The library understands CSS at-rules, media queries, keyframes, and custom properties, so complex stylesheets are formatted correctly. All processing happens client-side in your browser - no stylesheet data is ever sent to a server.
No - CSS beautification only changes formatting characters (spaces, newlines, indentation) that the browser's style engine ignores entirely. Selector specificity, declaration order, cascade priority, and all visual rendering remain completely identical. You can safely copy the formatted output back into your project without any functional side effects.
The tool is designed for standard CSS, but js-beautify handles many SCSS and Less syntax patterns correctly, including nested rules and variable declarations. For compiled output from Sass or Less build steps (which is standard CSS), it works perfectly. If you are working with raw .scss or .less source files with complex nesting or mixins, a dedicated SCSS formatter may produce more accurate results.
Use the companion CSS Minifier tool on ZipTools - paste your beautified CSS and it will strip all whitespace, remove comments, and produce the most compact single-line version possible with a byte-savings report. Keeping both the readable source and the minified production version is a common workflow: develop with the beautified copy and deploy the minified one.
There is no server-enforced file size limit because everything runs locally in your browser. Full theme stylesheets from WordPress, Shopify, or Bootstrap (typically 100-500 KB) format in under a second on most devices. For extremely large files over 1 MB, processing may take a few seconds depending on your hardware, but the operation will complete without any upload or timeout restrictions.