The best way to clean your CSS, and of course, optimize it – online.

A CSS optimizer and compressor tool is designed to improve the efficiency and speed of a website by minimizing the size of CSS (Cascading Style Sheets) files. These tools work by removing unnecessary characters from CSS files, such as whitespace, newline characters, comments, and block delimiters, which don’t affect the CSS execution but do increase file size. By doing so, the overall size of the CSS file is reduced, which can significantly improve load times for websites.

In addition to simple compression, these tools may also offer more advanced optimization features, such as:

  • Merging of similar styles: Combining multiple CSS rules that have identical properties to reduce redundancy.
  • Shortening of CSS property values: For example, converting #ffffff to #fff.
  • Reordering CSS rules: To enhance efficiency by grouping similar selectors and properties together.
  • Eliminating unused CSS rules: Identifying and removing styles that aren’t used on a website to decrease the filesize further.

Optimizing CSS not only speeds up website loading times but also can result in bandwidth savings for both the server and the end-users, especially important for users on slow or metered internet connections.

Many CSS optimizer and compressor tools are available as web services, command-line tools, or integrated features within broader web development tools and editors. Some popular tools include CleanCSS, CSSO, and PurifyCSS, among others. Developers often use these tools as part of their build process to automatically optimize CSS files before deploying them to production environments.