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CSS Minifier

Minify CSS stylesheets by removing comments, whitespace, and redundant characters.

Remove Comments Collapse Whitespace Remove Last Semicolon Remove Zero Units

CSS Input

Minified Output

How to Use

Paste CSSPaste your CSS stylesheet into the Input field on the left.

Select optionsChoose whether to remove comments, collapse whitespace, and apply other optimizations.

Click MinifyThe minified CSS appears in the Output field with file size savings.

Copy resultUse the Copy button to copy the minified CSS to your clipboard.

Use in productionPaste the minified CSS into your project or link to a .min.css file.

📌 All processing happens locally. Your CSS is never sent to any server.

About CSS Minifier

CSS Minifier is a free, browser-based utility built for developers and engineers who need a fast, reliable way to minify css stylesheets by removing comments, whitespace, and redundant characters. Whether you're debugging an API response, preparing data for deployment, or validating configuration files, this tool handles the job in seconds — with zero server calls. Everything runs locally in your browser, so your source code and data stay private.

Frequently Asked Questions

CSS minification typically reduces file size by 15-30%. A 50KB CSS file might reduce to 35-42KB. Combined with gzip compression on the server, savings of 70-80% are common.

It replaces zero values with units (like 0px, 0em, 0rem) with just 0. Since 0 has the same meaning regardless of units, this saves a few bytes. Example: padding: 0px → padding: 0.

Yes. CSS allows the last declaration in a rule to omit its semicolon. All modern browsers handle this correctly. Example: .foo{color:red;font-size:16px} is valid.

For small projects or one-off tasks, this manual tool works great. For ongoing projects, use a build tool like Vite, webpack, or PostCSS with cssnano, which automates minification in your build pipeline.