This tool is an online CSS code formatting and compression tool that helps developers quickly beautify messy CSS code or compress code size to reduce transmission and loading time. All operations are performed locally in your browser, and code is never uploaded to any server.

Main Features

• Format/Beautify:Indent, line-break, and align compressed or messy CSS code according to standard style, with selector line break support, improving code readability.
• Compress:Remove all excess whitespace, line breaks, and comments, with optional removal of trailing semicolons, shortening of color values, and removal of zero-value units to minimize file size.
• Syntax Validation:Check brace matching in CSS code to quickly locate unclosed rule blocks.
• Style Preview:Render CSS effects in real time (with a simple example HTML structure) to intuitively view styles.

CSS Compression Optimization Techniques

• Remove comments:Delete /* ... */ comments, typically reducing size by 5%-15%.
• Remove trailing semicolons:The semicolon after the last declaration in a rule block is optional; removing it further compresses the code.
• Shorten color values:#ffffff → #fff, and rgb(255,255,255) can also be abbreviated.
• Remove zero-value units:margin: 0px → margin: 0; zero values do not need units (except in special cases).

Main Use Cases

• Read or debug compressed CSS source code from third-party websites.
• Quickly beautify team members' CSS code style in projects.
• Compress CSS code before deployment to reduce network transmission size.
• Troubleshoot CSS bracket matching errors and quickly locate the cause of style failures.
• Format CSS snippets before sharing to improve readability.

Tool Features

• Single-column editing with line numbers: Input and output in the same text box with line numbers on the left, providing an IDE-like editing experience.
• Rich compression optimizations: Supports multiple compression methods including removing comments, removing trailing semicolons, shortening color values, and removing zero-value units.
• Configurable indentation: Supports 2 spaces, 4 spaces, and Tab indentation styles.
• Real-time statistics: Displays code line count, character count, selector count, and estimated size in real time.
• Style preview: One-click preview of CSS rendering effects, WYSIWYG.
• Safe and reliable: Pure front-end execution, no data uploaded, absolutely protects your code privacy.