Compressing CSS files is an important means to improve the loading speed of WordPress websites. 1. Use the compression functions that come with the cache plug-in, such as WP Rocket, LiteSpeed ??Cache or W3 Total Cache, and enable the compressed CSS option in the settings to automatically complete the compression and call; 2. Manual compression through online tools such as CSS Miniifier and CleanCSS, suitable for small amounts of files or staged cleaning; 3. Integrate tools such as Gulp and Webpack to achieve automated compression in the theme or construction process, suitable for users with development foundation. Each method has its own applicable scenarios, which helps to reduce file size and improve loading efficiency.
Compressing CSS files is an important step to improve the loading speed of WordPress websites. Simply put, it is to remove useless spaces, comments and redundant code in the style sheet to make the file smaller and load faster. For most sites, this step is both necessary and not difficult to achieve.
Use the compression function that comes with the cache plug-in
Many mainstream WordPress caching plug-ins (such as WP Rocket, LiteSpeed ??Cache or W3 Total Cache) have built-in CSS compression options. This type of plug-in not only provides the function of merging CSS files, but also automatically compresses output.
- The enable method is usually to go to the plug-in settings, and check "Compress CSS" or similar options in the "Performance" or "Optimization" tab.
- Some plugins will automatically generate compressed versions and are automatically called through the cache mechanism, without manually replacing the original file.
- Note: After enabled, it is recommended to check whether the front-end page is loading the style normally to avoid style loss.
This method is suitable for users who do not want to move codes and pursue stable operations.
Manually compress CSS with online tools
If you only want to compress a few CSS files, or want to clean it up before deployment, you can use online compression tools such as CSS Miniifier and CleanCSS.
The operation process is roughly as follows:
- Open the website and paste your CSS code in;
- The tool will return to the compressed version;
- Copy back and replace the original style sheet content.
The advantage of this method is that it is flexible and does not require reliance on plug-ins; the disadvantage is that it has to be repeated every time it is modified, which is not suitable for websites that frequently update styles.
Integrated compression steps in a topic or build process
For users who know a little about development, they can join the CSS compression process during the theme development stage. For example, using tools such as Gulp and Webpack to automatically complete compression during the compilation process.
A simple Gulp configuration may include:
- Install
gulp-clean-css
plugin; - Write a task to read the CSS file, compress it and output it to the specified directory;
- Automatically run compression tasks every time you save.
The benefit of doing this is once and for all, and the compression quality is usually higher. However, it requires a certain configuration foundation, which is suitable for people with development backgrounds.
Basically these methods. You can choose the right method according to your skill level. Although compressing CSS seems to be a trivial matter, it has a significant impact on overall performance, especially after the number of visits increases, the effect will be more obvious.
The above is the detailed content of How to minify CSS files in WordPress. For more information, please follow other related articles on the PHP Chinese website!

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