What this CSS formatter does and why you need it
This tool uses css_beautify (part of js-beautify) to re-indent your stylesheet with one property per line, configurable blank lines between rules, and proper spacing around selectors and braces. The result is CSS that is immediately scannable whether you are debugging a production bundle or reviewing a colleague's commit.
Minified CSS saves bytes on the wire but is unreadable by humans. When you need to inspect a compressed stylesheet — maybe pulled from a live site's DevTools or extracted from a bundled asset — running it through a formatter is the fastest path back to something editable.
How it works under the hood
css_beautify is a tokenizer-based beautifier. It scans your input token by token — selectors, braces, declarations, values — and re-emits them with consistent indentation and line breaks according to your chosen options. It does not build an abstract syntax tree or reorder anything.
The formatter does not validate your CSS, reorder properties, or merge rules — it only restructures whitespace and line breaks. Invalid properties or typos pass through unchanged. If you need validation, pair this with a linter like Stylelint. Vendor-prefixed properties (-webkit-, -moz-, etc.) are preserved in their original order.
Privacy and client-side processing
The formatting runs entirely in your browser — your CSS is never sent to any server. There is no backend processing, no logging of input content, and no analytics on what you paste. This makes the tool safe for internal stylesheets, design system tokens, or any CSS that is proprietary.
When you close or refresh the tab, the data is gone. The js-beautify library is loaded as a JavaScript module that executes locally in your browser's JS engine.
Tips and edge cases
Formatting does not change the visual output of your CSS — it only adjusts whitespace and line breaks. The formatter never reorders rules, so source-order-dependent specificity is preserved. It also does not validate CSS — unknown properties or typos pass through as-is.
SCSS and LESS syntax mostly works since css_beautify is tokenizer-based and does not require valid CSS grammar, but results are not guaranteed for all preprocessor features. CSS comments (/* ... */) are preserved in place. For very large stylesheets (several megabytes), formatting may take a second or two depending on your device.
Frequently asked questions
Is my CSS uploaded to a server?
No. The formatter runs entirely in your browser using js-beautify compiled to JavaScript. Your stylesheet never leaves your device.
Does formatting change how my CSS renders?
No. Formatting only modifies whitespace and line breaks. The cascade, specificity, and visual output remain identical.
Will the formatter fix invalid CSS?
No. It re-indents and spaces your code but does not validate, correct, or reorder anything. Typos and unknown properties pass through unchanged. Use a linter for validation.
Does it work with SCSS or LESS?
Mostly. Because css_beautify is tokenizer-based, preprocessor syntax like nesting, variables, and mixins generally passes through and gets re-indented. However, results are not guaranteed for all features.
What is the maximum file size I can format?
There is no hard limit. Practical performance depends on your browser and device. Most modern browsers handle stylesheets up to several megabytes without issue.