Messy or minified CSS becomes clean, consistently indented rules you can actually maintain — just paste, format, and copy the result. Nothing is uploaded; it all happens in your browser.
CSS Formatter is a quick, no-nonsense developer utility that runs entirely client-side, so your code and data never leave your machine.
No, it reformats for readability. Use a build tool for minification/optimization.
Yes, that is a primary use.
No — it runs in your browser.