Free online CSS minifier and compressor. Reduce CSS file size by removing whitespace, comments, and optimizing shorthand properties. Minify stylesheets for faster page loads and better Lighthouse performance scores. Essential for frontend developers optimizing web performance. 100% browser-based.
100% browser-based — your data never leaves your device
Minify and compress CSS by removing whitespace, comments, and optimizing property values.
Copy your CSS code and paste it into the input textarea above.
Press Minify to compress your CSS by removing whitespace, comments, and optimizing property values.
Copy the minified CSS for production use. See the size savings displayed below.
Drop a file here or click to browse
Ctrl+Enter to minify
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CSS Minifier is a free online text tool that minify and compress css by removing whitespace, comments, and optimizing property values. It works entirely in your browser — no downloads, no installations, and no server uploads required. content writers, developers, technical writers use CSS Minifier when they need a fast, privacy-respecting way to process text data without installing additional software. It supports capabilities such as whitespace removal, comment stripping, shorthand optimization. Additional features include size savings display. Common use cases include compressing css files for production deployment and faster load times, reducing stylesheet size for better core web vitals scores, optimizing css delivery for mobile networks and slow connections. All processing happens locally using modern browser APIs, which means your data never leaves your device. This makes CSS Minifier ideal for working with sensitive data, proprietary code, or any situation where privacy matters.
CSS Minifier is a free online text tool that helps you minify and compress css by removing whitespace, comments, and optimizing property values. Key capabilities include whitespace removal, comment stripping, shorthand optimization. All processing is done locally in your browser — no data is uploaded, stored, or shared with any server. There are no sign-ups, no file size limits, and no hidden charges. It is commonly used to compressing css files for production deployment and faster load times.
Copy your CSS code and paste it into the input textarea above.
Press Minify to compress your CSS by removing whitespace, comments, and optimizing property values.
Copy the minified CSS for production use. See the size savings displayed below.
| Category | Details |
|---|---|
| Input Limits | Maximum input length: Browser memory bound |
| Encoding support: UTF-8, UTF-16, ASCII, ISO-8859-1, Windows-1252 | |
| Supported Formats | Plain text, UTF-8, ASCII, Unicode, Percent-encoding (RFC 3986) |
| Browser Engine |
|
All operations run entirely in your browser using built-in Text APIs. No server uploads, no data storage, and no third-party requests.
CSS Minifier is ideal when you need to compressing css files for production deployment and faster load times without installing software or uploading data to a server. Since everything runs in your browser, there is no setup time and no risk of your data being stored on external servers. For for advanced text manipulation within an IDE, consider using VS Code. For for batch text processing on servers, sed/awk (command-line) may be a better fit. CSS Minifier fills the gap between heavyweight desktop tools and insecure online services that require uploading your data.
No. CSS Minifier processes everything entirely in your browser using JavaScript. Nothing you type, paste, or upload is ever transmitted to any server. Your data never leaves your device.
It removes whitespace, comments, and empty rulesets while optionally combining shorthand properties to reduce file size.
No. Minified CSS renders identically to the original — only unnecessary characters are removed.
Removes unnecessary spaces, tabs, and newlines while preserving selector and property structure.
Removes CSS comments to reduce file size without affecting styles.
Combines related properties into shorthand notation where safe.
Shows original vs minified size with byte count and percentage saved.
CSS Minifier is useful in a variety of scenarios across different workflows:
Compressing CSS files for production deployment and faster load times
Reducing stylesheet size for better Core Web Vitals scores
Optimizing CSS delivery for mobile networks and slow connections
Use the CSS Minifier for production and the CSS Formatter for development. Switching between them lets you optimize for both readability and performance.
For best results, remove unused CSS rules before minifying. This gives much larger file size savings than minification alone.
Explore more tools in the Text workspace:
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Lorem Ipsum Generator
Generate placeholder text for your design and development projects.
URL Encode/Decode
Encode or decode URLs and query strings with proper percent-encoding.
URL Query Parser
Parse URL query parameters into a readable key-value table.