CSS Minifier
Compress CSS by removing comments and whitespace
Input CSS
Minified
Original
Minified
Saved
CSS Minifier — Complete Guide & Instructions
MakeCard CSS Minifier squeezes production stylesheets to their smallest sendable size. Paste CSS into the input pane and the minified twin renders live beside it — comments stripped, whitespace collapsed, safe optimisations applied. A stats row shows original size, minified size and the exact percentage saved; tick “Keep /* comments */” if a licence banner must survive minification.
How to Use CSS Minifier
- 1 Paste your stylesheet into the “Input CSS” pane — or press “Load sample” to try it out.
- 2 Tick “Keep /* comments */” if header comments must be preserved.
- 3 The minified output appears instantly in the right pane.
- 4 Check the stats — Original, Minified and Saved % — at the bottom.
- 5 Press Copy to grab the compressed CSS for deployment.
Key Features & Capabilities
- Live minification as you type or paste.
- Optional comment preservation for licence banners.
- Sample loader for instant testing.
- Exact savings report — original chars, minified chars, % saved.
- Whitespace, newline and redundant-colon cleanup.
- One-click copy of the minified output.
Supported Formats & Specifications
| Parameter | Specification |
|---|---|
| Input | Plain CSS (paste or sample) |
| Output | Minified CSS string |
| Options | Keep /* comments */ toggle |
| Stats | Original size, minified size, % saved |
| Processing | Instant, in-browser |
Practical Everyday Use Cases
- Shrinking a stylesheet before deploying to production.
- Quick minification when a build pipeline is not available.
- Compressing embedded CSS for HTML emails or single-file pages.
- Checking how much a hand-written sheet would save after minification.
- Stripping comments before shipping CSS to clients.
Pro Tips for Best Results
- Keep the unminified source — minified output is for deployment, not editing.
- Preserve the licence comment if your framework or font requires attribution.
- Minify CSS and JS together for real wins — the JS Minifier tool handles the scripts.
- The saved-% stat flatters large comment-heavy files; even 15–20% is worthwhile on every page load.
Common Problems & Solutions
Rare — usually a pre-existing syntax error like a missing brace; the minifier may produce different output than intended, so validate the source CSS first.
Comments are stripped by default — tick “Keep /* comments */” before copying if the banner must remain.
Privacy & Security
100% Client-Side Execution
Your CSS is minified locally in the browser — no code is uploaded or logged.
Frequently Asked Questions
Everything you need to know about using CSS Minifier
Removes comments, whitespace and redundant characters browsers do not need — producing a smaller, identical-behaviour stylesheet.
Typically 15–30% depending on comments and formatting — the tool shows the exact percentage saved for your input.
No — minification only removes non-semantic characters; behaviour is identical unless the source CSS already had errors.
Enable the “Keep /* comments */” checkbox before copying — block comments survive minification.
Minification is one-way — beautify tools can reformat it, but comments are gone forever; always keep your readable source.
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100% free, browser-based, and private. No installation, registration, or file upload to external servers required.
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