YUI CSS Compressor

Tool Guide

Introduction

The online YUI Compressor CSS standardized minification tool is a high-performance CSS minifier designed to emulate the stylesheet reformatting mechanism of the classic YUI Compressor. It supports one-click space collapsing, redundant semicolon removal, and useless comment deletion for stylesheets, and can extremely compress large multi-line CSS into ultra-small single lines at high speed, greatly optimizing web loading performance.

Core Features

1. YUI-standard extreme style minification: Perfectly recognizes and reorganizes various CSS selectors, media queries, and property lists, safely cleaning up consecutive spaces between class braces and redundant trailing semicolons.
2. Smart selector and value preservation: While compressing size to the extreme, it ensures that specific CSS hack syntax, CSS variable declarations, and standard size value units are not broken, with an extremely low error rate.
3. 100% browser-offline secure sandbox: No size limit is imposed. Stylesheet restructuring and merging are completed entirely in the browser's local thread, refusing to leak your CSS design layout or web color scheme source code.

How to Use

1. Paste the original CSS stylesheet code you want to optimize for network transfer size into the original input box above.
2. In the parameter control panel, set whether to preserve specific CSS hacks or IE-specific prefixes, as required.
3. Click "Compress CSS Code", and the system will instantly output the extremely compressed, compact single-line code. Simply click to copy it with one click or download it as a `.min.css` stylesheet file.