CSS Formatter

A CSS formatter reads a stylesheet and rewrites it with consistent spacing, indentation, and line breaks so it is easy to read and maintain. It parses the CSS into its underlying structure of rules, selectors, declarations, at-rules, and comments, then prints that structure back out using a predictable layout: one declaration per line, a single space after each colon, and each nested block indented one level deeper than its parent. The style rules stay identical, but a file that arrived as one long unbroken line becomes something you can scan and edit.

The same tool works in reverse as a CSS minifier. Minifying strips every space, tab, line break, and (optionally) comment that a browser does not need, collapsing the stylesheet to the smallest byte-for-byte equivalent. A well-formatted 6 KB stylesheet often drops below 4 KB once whitespace is gone, which means fewer bytes over the network and a faster first paint. Beautify while you are writing and debugging; minify the copy you ship to production.

This formatter understands the parts of CSS that trip up naive find-and-replace scripts. Nested at-rules like @media and @supports keep their inner rules indented correctly, @keyframes blocks with percentage steps are preserved, string literals in content and url() values are left exactly as written, and comments are kept or removed on request. Everything runs entirely in your browser, so your stylesheet, including any proprietary design tokens or internal class names, is never uploaded, and the tool keeps working after the page has loaded even with no connection.

A small test shows what this CSS formatter online does. Paste @media (max-width:600px){.nav a,.nav button{padding:8px 12px;color:#333}} and click Beautify with 2 spaces. The media query opens its own block, .nav a and .nav button go on separate lines one level in, and each declaration sits on its own line with a space after the colon. The size badge reads 73 B → 98 B, +34%, because indentation adds bytes. Click Minify on that output and it returns to the original 73 bytes.