ProToolBox

CSS Minifier — Strip Comments & Whitespace, See Savings Instantly

Paste CSS—get minified styles, a percent-smaller stat, before→after character counts, optional Live updates, and one-tap copy. Runs only in your browser—no upload, no signup, no watermark.

Minify CSS online

Shrink stylesheets, email CSS, and embed blocks before deploy or handoff.

1 Paste CSS · 2 Minify · 3 Copy

CSS input

Minified output

Try . Minify markup? HTML minifier · JS minifier. JSON minifier.

Runs in this tab only—no server upload, no signup, no watermark.

Paste CSS—we strip block comments, collapse whitespace, and show % smaller and chars saved.

What you will see: Minified CSS, savings in the stats bar, and Copy CSS. Next: click Minify CSS or keep Live on.

Minified CSS appears here

Paste a stylesheet or snippet, or tap sample CSS.

Next: Copy CSS into your stylesheet or CMS. This is a fast whitespace pass—use PostCSS or your bundler for production-critical CSS. Turn off Live for very large files. · All tools

  • Works in your browser—runs on your device, not our servers
  • No upload required—your input stays in this tab
  • Free and instant
  • No account needed
  • Private by default—the same ProToolbox promise on every page

What this is for

CSS Minifier — Strip Comments & Whitespace, See Savings Instantly helps you format, validate, and encode before paste: works in your browser, no account needed. JSON, YAML, Base64, URLs, escapes—check here first, then ship to PRs, Slack, or configs.

  • Re-validate after every payload edit
  • Copy from the panel—nothing leaves your device until you do
  • Local run for tokens and internal data
  • Green here, then paste into production paths

Security: Fast correctness pass only—secrets still go through your team’s review.

Why minify CSS

Smaller stylesheets mean fewer bytes over the wire for snippets, email HTML, and static embeds. Doing it locally keeps proprietary themes off third-party minifier sites.

How it works

  1. Paste CSS (full file or fragment).
  2. Click Minify CSS or keep Live on.
  3. Read the stats bar for percent saved and character counts.
  4. Copy CSS or chain HTML / JS minifiers.

FAQ

  • Will this break calc() or custom properties? It only removes comments and collapses whitespace—it does not rename variables. Always verify in your target browsers.
  • String content in content: "…"? Whitespace inside quoted strings is preserved by the collapse step in typical CSS; still spot-check critical quotes.
  • Huge stylesheets? Turn off Live for multi-megabyte pastes to keep the tab responsive.

Bookmark this page for every stylesheet tweak—minified CSS is one paste away.

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