CSS Minification Tool

Quickly minify CSS code, reduce file size, improve website loading speed

22 uses | 5.0 rating

Minification Options

Remove Comments Remove Whitespace & Line Breaks Remove Unnecessary Semicolons Shorten Hex Colors Remove Zero Units Merge Identical Selectors

Input CSS Code

Minified Code

Copied!

Instructions

Paste CSS Code

Paste your CSS code that needs minification into the left input box.

Select Minification Options

Choose appropriate minification options according to your needs, such as removing comments and whitespace.

Start Minification

Click the "Start Minification" button and wait for completion. To format code, click the "Format Code" button.

Copy or Download Results

After minification, you can copy the minified code or download it as a CSS file.

CSS Minification Basics

What is CSS Minification?

CSS minification is the process of reducing CSS file size by removing unnecessary characters (such as spaces, comments, line breaks) and optimizing code structure. This helps improve website loading speed, reduce bandwidth consumption, and enhance user experience.

Remove Comments

Delete comment content in CSS files, retain core code functionality, and reduce file size.

Remove Whitespace

Delete excess spaces, tabs, and line breaks to make code more compact.

Simplify Syntax

Remove unnecessary semicolons, shorten hex color values, optimize zero value representation, etc.

Merge Selectors

Merge selectors with identical style rules to reduce duplicate code.

Code Optimization

Optimize CSS selectors, rewrite redundant rules, and improve code execution efficiency.

Improve Loading Speed

Reduce file size, accelerate download speed, and decrease rendering blocking time.

Minification Example Comparison

Original CSS

150 B

.header {
    background-color: #ffffff;
    padding: 20px;
    margin-bottom: 30px;
    /* Header style */
}

.nav-item {
    display: inline-block;
    margin-right: 15px;
    color: #333333;
}

Minified CSS

80 B (47% compression)

.header{background:#fff;padding:20px;margin-bottom:30px}.nav-item{display:inline-block;margin-right:15px;color:#333}

CSS Minification Best Practices

Keep unminified CSS in the development environment for easy debugging, and use minified CSS in the production environment.
Use version control systems to manage source files, do not directly edit minified files.
Combine CSS preprocessors (like Sass, Less) and build tools (like Webpack) to achieve automated minification.
Ensure CSS code has no syntax errors before minification to avoid unexpected issues after minification.
Test minified CSS for compatibility across various browsers to ensure styles display correctly.

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