Unminify CSS Online — Free CSS Formatter

Unminify minified CSS instantly with our free online tool. Restore readable formatting from compressed stylesheets. All processing in your browser.

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CSS Unminification

Unminify compressed CSS online. Restore readable formatting for debugging production styles.

Features

Restore the readability of your minified CSS code by adding spaces and line breaks.

Unminify

Restore the readability of your minified CSS code by adding spaces and line breaks.

Package used

CSSO

v5.0.5

CSSO (CSS Optimizer) is a powerful tool for optimizing CSS files by removing redundancies and compressing code.

Basic example

Input CSS

.container {
  margin: 20px;
  padding: 10px;
  background-color: #ffffff;
}

.button {
  color: #000000;
  font-size: 16px;
  border: 1px solid #cccccc;
}

Minified CSS

.container{margin:20px;padding:10px;background-color:#fff}.button{color:#000;font-size:16px;border:1px solid #ccc}

Minification options

Compression Level

Controls the aggressiveness of CSS compression

ConservativeConservative - Basic optimizations only

NormalNormal - Balance between size and compatibility

AggressiveAggressive - Advanced optimizations, may affect compatibility

Remove Comments

Removes all CSS comments from code

Comparison with/without option:

Original code

/* Header styles */
.header {
    background: #fff;
    padding: 20px;
}

/* Navigation */
.nav { display: flex; }

With removeComments: true

.header{background:#fff;padding:20px}.nav{display:flex}

With removeComments: false

/* Header styles */.header{background:#fff;padding:20px}/* Navigation */.nav{display:flex}

Difference

CSS comments are removed

Convert Colors

Converts colors to their shortest format

Comparison with/without option:

Original code

.button {
    background: #ff0000;
    color: rgb(255, 255, 255);
    border: 1px solid hsl(0, 100%, 50%);
}

With convertColors: true

.button{background:red;color:#fff;border:1px solid red}

With convertColors: false

.button{background:#ff0000;color:rgb(255,255,255);border:1px solid hsl(0,100%,50%)}

Difference

Colors are converted to shortest format

Merge Rules

Merges identical and adjacent CSS rules

Comparison with/without option:

Original code

.header {
    background: #fff;
    padding: 20px;
}
.header {
    margin: 10px;
}

With mergeRules: true

.header{background:#fff;padding:20px;margin:10px}

With mergeRules: false

.header{background:#fff;padding:20px}.header{margin:10px}

Difference

Identical CSS rules are merged

Minify Selectors

Optimizes CSS selectors to reduce their size

Comparison with/without option:

Original code

div.container > ul li:first-child {
    color: red;
}

div.container > ul li:last-child {
    color: blue;
}

With minifySelectors: true

div.container>ul li:first-child{color:red}div.container>ul li:last-child{color:blue}

With minifySelectors: false

div.container > ul li:first-child{color:red}div.container > ul li:last-child{color:blue}

Difference

CSS selectors are optimized

Beautify Options

Options for formatting and beautifying CSS (Beautify only, not for Minify/Unminify)

Indentation Size

Sets the number of spaces or tabs for indentation during Beautify

Original code

.header{color:red;padding:10px}

With 2 spaces

.header {
  color: red;
  padding: 10px;
}

With 4 spaces

.header {
    color: red;
    padding: 10px;
}

Difference

Indentation is customizable only for Beautify. Unminify always uses 2 spaces.

Indentation Type

Use spaces or tabs for indentation during Beautify

Original code

.header{color:red;padding:10px}

With spaces

.header {
  color: red;
  padding: 10px;
}

With tabs

.header {
	color: red;
	padding: 10px;
}

Difference

Spaces are more standard, tabs may be preferred according to your code conventions.

How to Unminify CSS Online

CSS unminification restores readable formatting to compressed stylesheets. Paste any minified CSS into our tool to add proper indentation, line breaks, and organize selectors. This is essential for debugging production stylesheets, reviewing third-party CSS frameworks, or understanding vendor styles.

CSS Beautifier — Formatting Your Stylesheets

Our CSS beautifier applies consistent formatting rules to your stylesheets — standardized indentation, property ordering, and clean selector formatting. Whether your CSS comes from a build process, a minifier, or another developer, beautification makes it clean and maintainable.

Concatenating CSS Files

Combine multiple CSS files into a single stylesheet to reduce HTTP requests and simplify deployment. Use our concatenation feature to merge files, then optionally minify the combined output. This is especially useful for projects without a CSS preprocessor or bundler.