CSS Formatter
ConverterBeautify or minify CSS with proper indentation, handling media queries, keyframes and nested rules, and strip comments for production stylesheets and bundles.
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About CSS Formatter
Format and beautify CSS code in your browser with custom indentation (2, 4, 6, or 8 spaces).Handles all CSS constructs including selectors, properties, values, @media queries, @keyframes animations, @font-face declarations, @supports feature queries, and nested rules. The formatter properly preserves comments, vendor prefixes, and URL references. Toggle between beautify mode (readable indented output) and minify mode (compact single-line output for production).100% client-side processing — your stylesheets never leave your browser. Ideal for cleaning up minified CSS from CDNs, reformatting inherited codebases, or preparing stylesheets for review. For example, a single-line minified CSS file is expanded so each rule stands on its own line, with selectors and declarations readable at a glance. Formatting also makes :root variables, layered rules, and duplicate declarations visible, helping you trace specificity and override issues.
How to Use
- Open the CSS Formatter tool
- Select the source and target formats
- Adjust the output options as needed
- Click the Convert button; results appear in real time
- Copy or export the result
Use Cases
- Rule & cascade cleanup — Expand minified CSS by selector rule layer to clarify how @media, @keyframes and plain rules stack together.
- Project cleanup — Standardize CSS indentation and formatting across your project for consistency.
- Style review — Format CSS before review to make selector and property structure clearer.
- Minified artifacts — Compress CSS to a single-line compact format, stripping whitespace for production builds.
- Trace overrides — Expand compressed styles to compare selector weight and duplicate declarations and find why a style is not applied.
FAQ
Does formatting change CSS styles?
No. Formatting only adjusts indentation, line breaks and spacing; selector, property and value semantics are unchanged, so rendering stays the same.
Does it support @media and @keyframes?
Yes. Properly handles nesting and indentation for media queries, keyframe animations, @supports and other at-rules.
Does it support minification?
Yes. Switch to minify mode to remove excess whitespace and line breaks for minimized CSS output.
Are comments preserved when minifying?
Minify mode removes ordinary comments by default; to keep important ones (like license headers) process them before minifying or use a comment-preserving option.
Does it support calc() and CSS variables?
Yes. calc() functions, var() references, and :where()/:is() pseudo-classes are correctly laid out with structure preserved.
Can minified code be made readable again?
Yes. Switch to beautify mode to restore indentation and expand selectors and declarations line by line for inspecting production styles.