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Beautify Minified CSS Online

Unminifying restores structure to compressed CSS, but beautifying goes further: it applies consistent indentation depth, standardised spacing around colons and braces, and predictable brace placement.

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Applies consistent indentation and brace placement conventions

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Standardises spacing around colons, semicolons, and selectors

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Handles nested at-rules with appropriate indentation depth

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  src="https://www.fixtools.io/css-tool/unminifier-beautifier?embed=1"
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Attribution-friendly: a small "Powered by FixTools" link appears in the embed footer.

How Beautification Differs from Simply Unminifying CSS

A basic unminifier reinserts whitespace at token boundaries: a newline before each opening brace, a newline after each semicolon, indentation inside each rule block. That produces readable output, but it does not necessarily follow any particular style convention. Beautification applies a specific set of formatting rules on top of the whitespace restoration. These conventions include where the opening brace appears (same line as the selector vs. next line), how many spaces of indentation to use, whether there is a space between a selector and the opening brace, and whether a space appears after each colon in declarations. The FixTools CSS Beautifier follows the most widely adopted convention: selector and opening brace on the same line separated by one space, two-space indentation for declarations, one declaration per line, closing brace on its own line.

These conventions matter because readable code has a visual rhythm. When every rule block follows the same structure, your eye learns where to look for property names and values. You can scan vertically through the selector list without reading declarations, locate the closing brace without counting characters, and estimate block length from vertical space. Code that varies its formatting style, even if syntactically valid, breaks that rhythm and slows reading. Beautification eliminates that variation by imposing a single style on the entire file, regardless of how many different formatting styles existed in the original source files before minification.

Beautification is distinct from the operation the CSS Formatter performs on already-readable CSS. The Formatter normalises an existing readable stylesheet's whitespace: it fixes inconsistent indentation or brace placement in code a developer wrote. The Beautifier works on a compressed blob that has no whitespace to fix and must reconstruct formatting from scratch. The input is fundamentally different, even though the output for both tools is formatted CSS. If your CSS is already readable but inconsistently styled, use the Formatter. If you are starting from minified output, use the Beautifier.

Indentation conventions remain one of the few topics where reasonable teams still disagree, and beautifying a foreign stylesheet immediately surfaces the question. Two spaces is the most common modern choice and the Prettier default; four spaces is traditional in older Microsoft and Java-influenced shops; tabs are favoured by teams who want each developer to render indentation at their own preferred width. The Beautifier outputs two spaces because it is the dominant convention in current open-source CSS, but the choice is mechanical and reversible. If your team standard differs, run the beautified output through Stylelint with the indentation rule set to your preferred value, or use VS Code's Convert Indentation command. The important property is consistency within a single file, not which specific convention you pick. Mixing conventions inside one stylesheet is what creates friction during code review.

MDN Web Docs: CSS Syntax Google CSS Style Guide

How to use this tool

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Paste any minified CSS into the input panel. The beautifier outputs code with each selector on its own line, opening braces on the same line as the selector, each property indented two spaces, and each closing brace on its own line.

How It Works

Step-by-step guide to beautify minified css online:

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Obtain the minified CSS
Copy the minified CSS from its source: a .min.css file, a CDN response, or a stylesheet copied from Chrome DevTools Network tab. The input should be compact CSS with minimal or no whitespace.
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Paste into the CSS Beautifier
Open FixTools CSS Unminifier and paste the minified content into the input field. The tool accepts any amount of compressed CSS, from a single minified rule to a full production stylesheet.
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Click Beautify
Click the Beautify button. The output panel displays the CSS with each selector on its own line, opening braces on the same line, declarations indented with consistent spacing, and closing braces on separate lines.
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Save the beautified output
Copy the output and save it to a .css file in your project or open it in your editor for inspection. The beautified file is ready for reading, searching, and editing.

Real-world examples

Common situations where this approach makes a real difference:

Preparing a minified file for a code review

Two team members disagree about whether a recent change introduced a specificity conflict. One of them beautifies the current production CSS bundle using FixTools and saves it to a file. The other does the same for the previous production version. They compare the two beautified files in VS Code's built-in diff viewer. The comparison clearly shows three changed declarations, confirming exactly what the deployed change contained and where the specificity conflict originates.

Understanding a vendor stylesheet before writing overrides

A developer needs to override a complex third-party modal component but does not know which CSS properties control the appearance. They locate the vendor's minified stylesheet, beautify it, and open the output in their editor. Using Cmd+F to search for the modal class name, they quickly identify the full set of properties and their current values. This lets them write precise, minimal overrides rather than blunt !important rules.

Documenting inherited styles from a legacy project

A team takes over a legacy project whose CSS exists only as a minified bundle. A developer beautifies the entire bundle, breaks it into logical sections manually, and adds comments to identify which rules belong to which components. The resulting documented file becomes the new source of truth for that stylesheet, replacing the opaque minified bundle in the repository.

Auditing animation keyframes from a production build

A performance engineer suspects that an animation in a production CSS bundle is running more frames than necessary. They extract the production stylesheet, beautify it, and search for @keyframes blocks. The beautified output clearly shows the keyframe percentages and animated properties. They can now evaluate whether any interpolation steps can be removed to reduce animation complexity.

Pro tips

Get better results with these expert suggestions:

Use beautified CSS as a code review aid

When reviewing a pull request that includes a minified CSS change, beautify both the before and after versions and compare the two readable outputs in a diff tool. This makes it easy to see which specific rules changed, rather than trying to identify differences in a minified diff where character position matters and line numbers are useless.

Beautified CSS searches better in editors

VS Code, Sublime Text, and other editors provide symbol-based navigation that works on CSS selectors. After beautifying, you can use Cmd+Shift+O (VS Code) to jump to any selector in the file. This navigation is unavailable in minified CSS because the entire file may appear as a single symbol. Beautifying transforms a debugging obstacle into a navigable document.

Check for merged selector groups after beautifying

cssnano merges selectors that share identical declaration blocks. For example, h1 and h2 with the same font-size may be combined into h1,h2 {}. After beautifying, these appear as comma-separated selector lists on a single line. Be aware of this if you plan to edit the rule and target only one of the selectors.

Beautify then minify to measure optimisation impact

To understand what a minifier gained from a specific stylesheet, beautify the minified output and measure the character count, then compare it to the minified input character count. The ratio tells you exactly how much whitespace and comment weight the build pipeline removed. This helps justify or question minification steps in your build process.

Check brace nesting in at-rules after beautifying

Complex minified CSS with nested @media inside @supports or multiple @keyframes blocks can have deeply nested braces. After beautifying, scroll through at-rule blocks to confirm the indentation depth looks correct and each closing brace aligns with its opening rule.

Compare beautified output against your project style guide

If your project uses a specific style convention such as four-space indentation or opening braces on new lines, copy the beautified output into your editor and run your linter or formatter over it to bring it in line with your project standards.

Beautify before adding comments

When reconstructing a source file from beautified output, add your own section comments after beautifying rather than before. This ensures the comments appear at the right indentation level and do not interfere with the beautification step.

FAQ

Frequently asked questions

The FixTools CSS Beautifier follows the most widely adopted CSS formatting style: selectors appear on their own line, the opening curly brace appears on the same line as the selector separated by one space, each property-value declaration appears on its own indented line, declarations are indented two spaces from their enclosing selector, semicolons follow every declaration, and closing braces appear on their own line. At-rules like @media and @keyframes are formatted with their block content indented one additional level. This style matches the default output of Prettier and most major CSS linters.

If you need a specific indentation style that differs from the tool default, the easiest approach is to beautify first with FixTools to get expanded readable CSS, then paste the output into your code editor and run your project's formatter or linter. Tools like Prettier with a .prettierrc config, Stylelint with the indentation rule, or VS Code's built-in Format Document command will normalise the indentation to whatever your project specifies. The beautifier gives you the readable starting point; your project tooling applies the final style.

No. Beautification adds only whitespace characters between tokens. Whitespace has no effect on CSS selector specificity or any other cascade calculation. The browser parses the beautified output and calculates specificity identically to how it parses the minified input. The only characters that determine specificity are the selector tokens themselves, none of which are added, removed, or changed by beautification.

When a minifier like cssnano merges two or more selectors that share identical declarations, the merged selector group is preserved in the minified output as a comma-separated list. The beautifier expands the declaration block normally but keeps the selector group on a single line because it is syntactically one selector rule. If your original source had h1 {} and h2 {} as separate rules with identical content, the minified output may show h1,h2 {} as a single rule, and the beautifier will reproduce that.

Yes, completely. CSS custom properties declared with the -- prefix and their values are standard CSS declaration tokens. The beautifier places each custom property on its own indented line, preserving the property name and value exactly as they appear in the minified input. The same applies to var() references in property values. Custom property values that contain spaces, such as --spacing: 8px 16px, are preserved with their internal spacing intact.

The CSS Beautifier (part of the Unminifier tool) is designed for minified input: compressed CSS with little or no whitespace. It reconstructs formatting from scratch. The CSS Formatter is designed for readable input: CSS that a developer wrote but that may have inconsistent indentation or spacing. It normalises existing whitespace rather than rebuilding it. If your input is a minified production file or a dense blob with no line breaks, use the Beautifier. If your input is already readable CSS with inconsistent formatting, use the Formatter.

CSS nesting (the native & nesting syntax without a preprocessor) is an emerging CSS feature that some build tools compile away and others preserve. If the minified CSS you paste contains native CSS nesting syntax, the beautifier will expand the outer rule and its nested content, applying appropriate indentation to the nested rules. Support for nesting is growing in modern browsers, and FixTools handles the syntax as standard CSS token structure.

Inline style attributes contain CSS declarations without selectors or braces. Copy only the value of the style attribute: the text between the quotes, not including the style= or the quotes themselves. Paste that text into the CSS Beautifier. The tool will expand the declarations with each property on its own line. Note that inline style declarations do not have a selector or a wrapping brace, so the output will be a list of property-value pairs rather than a complete rule block.

Prettier and the FixTools Beautifier converge on similar output for most CSS, but they differ in scope. Prettier is an opinionated formatter that enforces print width, sorts certain declarations, and reflows long lines according to a configured strategy. The Beautifier focuses on restoring whitespace structure: one declaration per line, consistent indentation, predictable brace placement. For a quick read of an unfamiliar minified file, the Beautifier is faster because it runs in the browser with no install. For ongoing maintenance of CSS you author, Prettier integrated with your editor and pre-commit hooks gives stronger consistency guarantees because it runs on every save. The two are complementary: use the Beautifier to make minified CSS readable, then paste into a Prettier-managed project if you plan to keep working in it.

Yes. Vendor-prefixed properties such as -webkit-, -moz-, and -ms- variants appear on separate indented lines in the order they were present in the minified input. Standard practice is to list prefixed properties first and the unprefixed standard property last so that browsers supporting the standard use it while older browsers fall back to the prefix. Autoprefixer follows this order during builds, and the Beautifier preserves it. When auditing a beautified file, blocks containing four or five prefixed variants of the same property are a hint that the original build targeted very old browsers. Trimming obsolete prefixes from the source (using a current Browserslist target) usually shrinks the production bundle by several percent without affecting any shipping browser.