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CSS Beautifier / Formatter

Format, indent, and beautify minified or messy CSS code — with configurable indentation and sorting options.

Last updated: March 25, 2026

Client-Side Processing
Input Data Stays on Device
Instant Local Execution

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What is CSS Beautifier / Formatter?

CSS Beautification (also called formatting or pretty-printing) transforms compressed, minified, or inconsistently indented CSS into clean, consistently formatted code with proper indentation, newlines between declarations, and blank lines between rule blocks. It is the inverse operation of CSS minification — while minification removes all unnecessary whitespace to reduce file size, beautification reintroduces whitespace to maximize human readability.

Developers encounter minified CSS constantly: third-party library stylesheets (Bootstrap, Tailwind CSS bundles), legacy codebases that only committed minified assets, CSS extracted from live websites using browser DevTools, and vendor-provided CSS themes. Being able to instantly transform a single-line CSS blob into readable, navigable code is an essential debugging and learning skill. This tool also supports sorting properties alphabetically and ordering vendor prefixes correctly relative to their standard equivalents.

How to Use CSS Beautifier / Formatter

1

Paste minified, compressed, or messy CSS code into the input area on the left

2

Choose your preferred indentation: 2-space, 4-space, or tab indentation

3

Toggle "Sort Properties" to alphabetically sort declarations within each rule block (optional)

4

Toggle "Sort @-rules" to group and order @charset, @import, and @media rules at the top

5

Click "Beautify" — the formatted CSS appears in the output panel with a character/line reduction stat

6

Copy the formatted CSS or download it as a .css file

Common Use Cases

  • Reading and understanding a minified third-party UI library stylesheet (Bootstrap, Bulma)
  • Debugging live site styles by copying CSS from browser DevTools and formatting it for readability
  • Restoring legacy CSS codebases that were accidentally committed in minified form without source maps
  • Standardizing inconsistent CSS formatting across a team before code review
  • Learning CSS techniques by reformatting obfuscated or minified production stylesheets from inspiration sites
  • Extracting and formatting inline styles from an existing HTML email template for editing
  • Making vendor-provided theme CSS readable before customizing it for a brand redesign
  • Preparing CSS code for pair programming sessions where both developers need to read the code comfortably

Example Input and Output

Formatting a single-line minified CSS rule block into readable code:

Minified CSS input
.nav{display:flex;flex-direction:row;justify-content:space-between;align-items:center;padding:0 24px;height:64px;background:#1a1a2e;box-shadow:0 2px 8px rgba(0,0,0,.3)}.nav-link{color:#e0e0e0;text-decoration:none;font-size:14px;font-weight:500;transition:color .2s ease}.nav-link:hover{color:#7c6af7}
Beautified CSS output (4-space indent)
.nav {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    padding: 0 24px;
    height: 64px;
    background: #1a1a2e;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.nav-link {
    color: #e0e0e0;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s ease;
}

.nav-link:hover {
    color: #7c6af7;
}

Client-Side Processing

All CSS formatting runs in your browser. Proprietary CSS from internal projects, paid themes, or licensed UI kits is never transmitted to our servers.

Source Maps Are Better

For production CSS from your own codebase, source maps (sourceMappingURL) give you an even better experience — they map minified code back to the original source in DevTools directly. If your build tool generates source maps, enable them and you'll never need to manually beautify your own CSS.

Vendor Prefix Note

If the minified CSS contains -webkit-, -moz-, or -ms- vendor prefixes, the beautifier preserves them in order. However, most modern CSS properties no longer require vendor prefixes — if you're writing new CSS, use standard unprefixed properties. Only animation, transform, and a handful of others still occasionally need a prefix for older browser support.

Frequently Asked Questions

Does CSS beautification change the browser behavior?
No. CSS beautification only changes whitespace and newlines — characters that are completely irrelevant to CSS parsing. The cascade, specificity, inheritance, and computed styles are identical in both minified and beautified forms. The only difference is how human-readable the code is.
What is the difference between CSS beautification and CSS linting?
Beautification (formatting) automatically rewrites spacing and indentation — it cannot break valid CSS. Linting (Stylelint) analyzes CSS for potential errors, deprecated properties, specificity issues, and policy violations, but does not auto-fix them all. Use beautification to make code readable, then linting to enforce coding standards.
What does "sort properties" do, and is it safe?
Sort Properties reorders CSS declarations within a rule block alphabetically (e.g., background before border before color before display). It is safe — CSS does not care about declaration order within a rule block with one important exception: shorthand properties like background must come before their overriding longhand (background-color, background-image). Sorting may potentially move a shorthand after its longhand, so review output before using in production.
Why does CSS from browser DevTools look compressed?
Modern build tools (webpack, Vite, Parcel) minify CSS output for production builds. When you use browser DevTools to inspect styles and copy them, you're reading the minified production version. Paste the minified CSS here to format it before reading or editing. Note that class names may also be hashed/obfuscated (like .css-2k3j4) if CSS Modules or Styled Components are used.
Can the beautifier handle SCSS or Less syntax?
The beautifier is designed for standard CSS syntax. It will handle CSS-compatible SCSS (no nesting, no variables) reasonably well. However, SCSS-specific features like nested rules (&:hover { }), variables ($primary-color), and mixins (@mixin) may not format correctly. For SCSS formatting, use Prettier with the prettier-plugin-scss plugin.
Should I commit beautified CSS to source control?
For new projects using build tools: commit the human-readable source CSS (or SCSS/Less), and let the build tool generate minified output. Never commit only the minified file without source. For legacy projects with only minified files: beautify, review, then commit the beautified version as a starting point for future maintenance.

How This Tool Works

The minified CSS string is parsed using a token-by-token approach: braces ({}) demarcate rule blocks, semicolons (;) demarcate declarations, and colons (:) separate property names from values. Each token is collected and then re-serialized with configurable indentation injected between declarations, newlines inserted between property blocks, and blank lines added between selectors. If property sorting is enabled, declarations are sorted using Array.prototype.sort() with a locale-aware comparator before serialization.

Technical Stack

Browser-native JavaScriptToken-based CSS parserConfigurable indentation engineClient-side only

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