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CSS Beautifier

Format and pretty-print minified or messy CSS with proper indentation, line breaks, and consistent spacing.

Input CSS
Formatted CSS

About CSS Beautifier — CSS Beautifier Online & CSS Formatter

This free CSS beautifier online reformats minified, compressed, or poorly structured CSS into clean, consistently indented, human-readable code. Paste any CSS — whether minified by a build tool, exported from a design tool, or inherited from a legacy codebase — into the input panel and click Beautify. Each selector block gets its own section with blank line separation, each property is placed on its own line with consistent indentation, and comma-separated selectors are split to individual lines. This CSS formatter also preserves all comments in the original source.

Developers use a CSS formatter constantly during code reviews, debugging sessions, and when working with third-party stylesheets that were processed by minifiers like CSSNano or clean-css. Minified CSS is efficient for production delivery but completely unreadable for humans. This CSS beautifier online restores the readability of minified CSS so you can understand the structure, find the rule you need to modify, and make changes without risking accidental edits to adjacent rules crammed on the same line.

How to Use the CSS Beautifier

  1. Select your preferred Indent style from the dropdown at the top: 2 spaces (most common in modern codebases), 4 spaces (common in older conventions), or Tab (used in projects that enforce tab-based indentation via .editorconfig).
  2. Paste your CSS code — minified or otherwise — into the Input CSS panel on the left. The input accepts any valid CSS including rules with nested media queries, selectors with multiple declarations, and blocks with CSS comments.
  3. Click Beautify CSS. The formatted output appears instantly in the Formatted CSS panel on the right.
  4. Review the formatted output. Each rule block is separated by a blank line, each declaration is on its own indented line, and comma-separated selectors are each on their own line for readability.
  5. Click Copy at the top right of the output panel to copy the formatted CSS to your clipboard, then paste it directly into your code editor or stylesheet file.

Formatting Features

  • Consistent rule block separation: Each CSS rule block is followed by a blank line, making it easy to scan a large stylesheet and jump to the rule you are looking for.
  • Configurable indentation: Choose from 2 spaces, 4 spaces, or tab characters to match your project's coding style and any existing .editorconfig or linting rules in your codebase.
  • Multi-selector splitting: Comma-separated selectors such as h1, h2, h3 are split onto individual lines — one selector per line — making it easier to add, remove, or modify specific selectors without affecting others in the list.
  • Comment preservation: CSS comments (/* ... */) are retained in the output at their correct position in the rule hierarchy, preserving documentation and section markers.
  • Whitespace normalization: Extra spaces, trailing whitespace, and inconsistent spacing around colons and semicolons are normalized to a consistent style throughout the output.

Tips for Getting the Best Results

  • Match the indentation style to your project's linting rules: If your project uses Stylelint or Prettier with specific indentation configuration, select the matching option in the Indent dropdown before beautifying. This avoids creating a diff that is entirely whitespace changes when you paste the formatted CSS into version control.
  • Use the beautifier to understand minified third-party CSS: When debugging a CSS library or component stylesheet that was delivered in minified form, paste it into the input and beautify it to make the structure readable. This is much faster than trying to parse minified CSS line by line in a browser devtools panel.
  • Beautify before diffing: If you receive a CSS file that was modified externally and you need to compare it to your version, beautify both files with the same indent settings before running a diff. This ensures the comparison highlights only meaningful content changes, not formatting differences.
  • Handle large files in sections: For very large minified stylesheets (hundreds of kilobytes), consider copying and pasting specific rule sections rather than the entire file at once. This gives faster results and makes it easier to find the specific rules you need.
  • Verify the output before committing: Beautification is a purely cosmetic operation that should not change behavior, but always do a quick visual scan of the output to confirm that all your selectors, property values, and media query conditions are intact before replacing your original file.

Why Use a CSS Beautifier Online

A browser-based CSS beautifier online is available instantly without installing Prettier, Node.js, or any other tool. It works on any machine — including locked-down work computers where you cannot install software — and on any operating system. Because all CSS processing runs locally in JavaScript, your stylesheet code is never transmitted to any server, which matters when working with proprietary, client, or internal codebases that are subject to confidentiality requirements.

Junior developers use this CSS formatter to understand the structure of complex stylesheets they inherit. Senior developers use it during code reviews to quickly read through minified CSS changes in pull requests. DevOps engineers use it to inspect CSS bundles in production builds to verify that the expected rules are present. Accessibility testers use it to format stylesheets before searching for specific properties like color, background, or outline that affect visual accessibility.

Frequently Asked Questions about CSS Beautifier

No. CSS beautification only adds whitespace — newlines, spaces, and blank lines — to make the code more readable. It does not alter any selector names, property names, property values, or the order of rules. The formatted CSS is functionally identical to the minified input and will produce exactly the same rendered result in every browser. The only difference is that the formatted version is human-readable and significantly larger in file size due to the added whitespace.
Both are purely stylistic preferences with no effect on how CSS is parsed. Two-space indentation is common in JavaScript-heavy projects and modern web frameworks like React, Vue, and Angular. Four-space indentation is traditional in many server-side language conventions and older web projects. Tab indentation uses a single tab character and can be rendered at any visual width by setting tab size in the editor. Choose the option that matches your project's existing style guidelines or .editorconfig settings.
Yes. The formatter handles nested structures including @media queries, @keyframes blocks, and @supports rules. Properties inside nested blocks are indented relative to their parent block. CSS nesting syntax (native CSS nesting with & selectors) is treated as token text and formatted correctly as long as it follows valid CSS brace structure. SCSS and LESS syntax may not format correctly because they use different nesting conventions not supported by this CSS-specific formatter.
No. All formatting runs entirely in your browser using JavaScript. Your CSS code is never transmitted to any server at any point. The tool processes your input locally and produces the formatted output locally — there are no network requests after the page loads. This makes it safe to paste proprietary stylesheets, internal design system code, or client project CSS without any concern about confidential code leaving your machine.
This tool is designed for plain CSS and may produce unexpected results with SCSS or LESS-specific syntax such as nested selectors using &, @mixin definitions, @include statements, variables with $ or @ prefixes, and interpolation syntax. For SCSS formatting, use a dedicated SCSS formatter that understands preprocessor syntax. For plain CSS output from compiled SCSS or LESS files, this tool works correctly.
Yes. The formatter handles minified CSS from Bootstrap, Tailwind CSS (in compiled form), Bulma, Foundation, and other popular CSS frameworks. Paste the minified CSS from a framework's dist file and the formatter will produce a readable version with each rule block separated and each property on its own line. This is useful when you need to understand which framework rules affect a specific element or find the source of an unexpected style override.
CSS minification is the process of removing all unnecessary whitespace, newlines, and comments from a CSS file to reduce its file size and improve page load performance. A minified CSS file may compress a 100KB stylesheet to 60KB or less by removing all whitespace that is not required by the CSS parser. The resulting file is valid CSS but is written as a continuous stream of characters with no line breaks, making it essentially impossible to read or edit directly. Beautification is the reverse process that restores the whitespace for human readability.
Only if the beautified format matches your project's code style. If your project uses a CSS formatter like Prettier as part of its CI pipeline, committing code formatted by this tool may create style conflicts unless both tools use identical settings. For projects without automated formatting, beautified CSS is far preferable to committing minified CSS to version control because readable code is easier for teammates to review, understand, and modify. Minified CSS in version control provides no performance benefit since build tools re-minify for production anyway.