This formatter expands CSS into a conventional readable layout: one selector group per line, one declaration per line, a space after each colon, and nested rules inside media queries indented one level. That structure is what makes a stylesheet reviewable — with everything on one line you cannot see that a selector is declared twice, or that a later rule is silently overriding an earlier one. Formatting a minified production stylesheet is also the quickest way to understand a third-party theme or widget before you try to override it. The transformation is purely presentational: selectors, order and specificity are unchanged, so the cascade behaves exactly as before.
Free, fast, and runs entirely in your browser — no signup, no upload to a server.