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CSS & JS Minifier

Strip comments and whitespace from CSS or JavaScript to shrink files. Free, instant and private โ€” no sign-up required.

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About the CSS & JS Minifier

The CSS & JS Minifier is a free online tool designed for developers to instantly shrink their style sheets and scripts by removing comments and unnecessary whitespace, making it easier to manage and maintain large projects.

Use the minifier during development or before a launch to significantly reduce file sizes, with typical savings ranging from 20-50%, and improve page load times, especially for users on slower networks like 2G, which is still widely used in many parts of India.

Our minifier works entirely in your browser, ensuring that your code remains private and secure, with no need to upload files to our servers, and provides accurate results, making it an essential asset for any developer looking to optimize their website's performance and reduce bandwidth costs.

How to use the CSS & JS Minifier

  1. Paste your CSS or JavaScript code into the editor pane to get started with the minification process.
  2. Click the 'Minify' button to initiate the compression, and our tool will instantly remove unnecessary characters and whitespace.
  3. Review the minified code in the preview window and observe the byte-saved counter to see the reduction in file size.
  4. Copy the minified code to your clipboard or click 'Download' to save it as a file, ready to be used in your project, and easily integrate it into your workflow using tools like Git or SVN.

Tips & benchmarks

  • Keep your original source code under version control and only commit the minified file if you need to deploy significantly smaller assets, ideally 100% smaller, to reduce storage costs and improve collaboration.
  • After minifying, test your website on a staging server to ensure that the load time increase is acceptable, aiming for no more than a 5% increase for large applications, and use tools like Google PageSpeed Insights to monitor performance.
  • If you're using a Content Delivery Network (CDN), enable gzip compression on the server to further reduce the file size by an additional 15% after minification, and consider using a CDN that supports Brotli compression for even better results.
  • Use the minifier on CSS files larger than 10 KB to see noticeable savings, as files smaller than this often have minimal impact on overall page load times, and prioritize minifying files that are used frequently or have a high traffic volume.
  • Remember that minification can increase build time, so aim for less than 30 seconds for a typical project to ensure efficient development, and consider using a build tool like Webpack or Rollup to automate the minification process.

Frequently asked questions

Will this minifier break my JavaScript?

No, our minifier is designed to preserve the functionality of your code, and it only removes unnecessary characters and whitespace. However, it's always a good idea to test your minified code to ensure that it works as expected.

Can I minify CSS and JavaScript together?

Yes, you can minify both CSS and JavaScript files using our tool, but it's recommended to minify them separately to ensure that the minification process is applied correctly and to avoid any potential issues.

Is it safe to use in the browser?

Yes, our minifier works entirely in your browser, and it does not upload your files to our servers. This ensures that your code remains private and secure, and you can use the tool with confidence.

Does it preserve comments?

No, our minifier removes comments from your code to reduce the file size. However, this is a standard practice in minification, and it does not affect the functionality of your code.

How much size reduction can I expect?

The size reduction depends on the complexity and structure of your code, but you can typically expect a reduction of 20-50% in file size. This can vary depending on the specific code and the minification settings used.

Do I need to install any software?

No, our minifier is a free online tool that works entirely in your browser. You do not need to install any software or plugins to use the tool, and you can access it from anywhere using a modern web browser.

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