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CSS Beautifier

Beautify CSS with clean indentation and optional comment preservation.

About CSS Beautifier

Minified CSS is essential for production performance, but it becomes completely unreadable the moment you need to debug a layout issue, understand someone else's stylesheet, or audit the styles injected by a third-party widget. CSS Beautifier takes any minified, concatenated, or poorly formatted CSS and reformats it into clean, consistently indented code with each property on its own line, selectors properly separated, and braces aligned. Paste the output of any CSS minifier, a CDN-hosted stylesheet, browser DevTools computed styles, or a legacy file that was never formatted, and the beautifier instantly produces readable code you can work with. The formatter handles standard CSS, media queries, keyframe animations, pseudo-classes, custom properties, and nested at-rules without mangling selector specificity or property order.

Why use CSS Beautifier

Instant Readability Restoration

Transforms a single-line minified stylesheet into properly indented, human-readable CSS without any configuration or install step.

Handles All CSS Syntax

Correctly formats media queries, @keyframes, @font-face, custom properties (--var), pseudo-selectors, and modern nesting syntax without mangling rules.

Configurable Indentation

Choose 2-space, 4-space, or tab indentation to match your team's existing style guide and avoid mixed-whitespace diffs on check-in.

Property-Per-Line Formatting

Places every CSS declaration on its own line so git diff, code review, and search operations work at the property granularity level.

Useful for Third-Party Audits

Read and audit minified CSS injected by analytics scripts, chat widgets, or CMS plugins by beautifying it first to understand what styles are applied.

Fully Private In-Browser

Your stylesheet content never leaves your browser — ideal when working with proprietary or unreleased design system code.

How to use CSS Beautifier

  1. Paste your minified or unformatted CSS into the input area on the left.
  2. The formatted output appears immediately in the right panel — no button press required.
  3. Adjust the indentation size using the selector (2 spaces, 4 spaces, or tab) to match your project's style guide.
  4. Review the formatted CSS, checking that all selectors, properties, and at-rules are correctly parsed.
  5. Click Copy to copy the beautified CSS to your clipboard in one click.
  6. Paste the formatted code directly into your stylesheet, code editor, or documentation.

When to use CSS Beautifier

  • When debugging a layout bug in minified production CSS that you cannot read in its compressed form.
  • When auditing a third-party CSS file (from a CDN, npm package, or plugin) to understand what styles it applies before including it in your project.
  • When onboarding onto a legacy codebase where stylesheets were never formatted and existing code is difficult to navigate.
  • When extracting and reading computed styles copied from browser DevTools, which concatenate rules into a compact format.
  • When preparing a minified CSS file for a code review or pull request so reviewers can understand the changes at the property level.
  • When copying styles from a design tool export (Figma, Webflow, or similar) that produces compact single-block output you need to edit manually.

Examples

Minified rule set

Input: body{margin:0;padding:0;font-family:sans-serif;background:#0d0d0d;color:#e4e4e4}.btn{display:inline-flex;align-items:center;padding:8px 16px;border-radius:8px}

Output: body { margin: 0; padding: 0; font-family: sans-serif; background: #0d0d0d; color: #e4e4e4; } .btn { display: inline-flex; align-items: center; padding: 8px 16px; border-radius: 8px; }

Minified media query

Input: @media(max-width:768px){.sidebar{display:none}.main{width:100%}}

Output: @media (max-width: 768px) { .sidebar { display: none; } .main { width: 100%; } }

Keyframe animation

Input: @keyframes spin{0%{transform:rotate(0deg)}100%{transform:rotate(360deg)}}

Output: @keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

Tips

  • Paste CSS directly from browser DevTools → Sources panel to instantly read the full stylesheet of any live site in a readable format.
  • Use 2-space indentation if your project uses ESLint or Prettier with the default CSS settings — it matches the most common style guide convention.
  • After beautifying a large stylesheet, use your browser's Ctrl+F to search for a specific property or selector — much faster than scrolling minified code.
  • Beautify CSS before running a diff against an older version to get meaningful line-level changes rather than a single-line diff.
  • Copy only the specific rule block you are debugging rather than the entire stylesheet — the tool formats any valid CSS fragment, not just full files.

Frequently Asked Questions

Does the CSS beautifier change the visual behavior of my styles?▾
No. Beautifying only changes whitespace and line breaks — it does not reorder properties, rename selectors, or modify values. The rendered output of beautified CSS is identical to the minified source.
Can it handle CSS with vendor prefixes like -webkit- and -moz-?▾
Yes. Vendor-prefixed properties like -webkit-transform or -moz-appearance are treated as standard declarations and formatted on their own lines alongside non-prefixed equivalents.
Does it support modern CSS features like custom properties and @layer?▾
Yes. Custom properties (--color-primary: #f00), @layer declarations, @container queries, and CSS nesting (where supported) are all parsed and formatted correctly by the beautifier.
What happens if my CSS has a syntax error?▾
The beautifier attempts a best-effort format and will produce output even with minor syntax errors. Badly malformed CSS (unclosed braces, missing semicolons) may result in unexpected formatting — use the output as a starting point and fix any flagged errors in your editor.
Can I beautify SCSS or Less with this tool?▾
The tool is designed for standard CSS. SCSS and Less contain syntax extensions (variables, mixins, nesting with &) that may not be parsed perfectly. For preprocessor files, use dedicated SCSS/Less formatters or Prettier with the appropriate plugin.
Should I commit beautified CSS or minified CSS to my repository?▾
Commit the beautified, human-readable source to version control so diffs are meaningful and code review is possible. Generate minified CSS as a build artifact at deploy time using your build tool (Vite, PostCSS, Parcel, etc.) — never commit minified files as your primary source.
How does the CSS beautifier handle comments?▾
Both block comments (/* ... */) and inline comments are preserved in the output. Block comments are placed on their own lines above the rules they precede, maintaining their original position relative to the declarations.
Is there a size limit on the CSS I can paste?▾
There is no hard limit enforced by the tool. The formatter runs entirely in your browser; very large stylesheets (500KB+) may take a second to process but will complete without truncation.

Explore the category

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Glossary

CSS Minification
The process of removing whitespace, comments, and redundant characters from CSS to reduce file size for faster network transfer. Minified CSS is not intended to be read or edited directly.
CSS Beautification
The reverse of minification — adding consistent whitespace, indentation, and line breaks to CSS to make it human-readable and editable. Also called formatting or pretty-printing.
At-Rule
A CSS statement beginning with an @ symbol that provides instructions to the CSS engine. Examples include @media, @keyframes, @import, @font-face, and @layer.
Selector Specificity
A weight assigned to CSS selectors that determines which rule wins when multiple rules target the same element. Beautification does not affect specificity — only whitespace changes.
Custom Property
A CSS variable defined with a double-dash prefix (e.g. --primary-color: #f00) and referenced via var(). Part of the CSS Custom Properties specification (Level 1).
Declaration Block
The set of property–value pairs enclosed in curly braces {} following a CSS selector. Beautifiers place each declaration on its own indented line within the block.