postcss-colormin is a PostCSS plugin that minifies colors in your CSS files. It reduces file sizes by converting colors to their smallest possible representation (e.g., converting #ffffff to white). This plugin optimizes color values like hexadecimal, RGB, and HSL, ensuring cross-browser compatibility while improving CSS performance. Integrate it into your PostCSS workflow for cleaner, more efficient stylesheets and to reduce the final size of your CSS files.