Dev & Data ToolboxFree Online Code Minifier
Compress JavaScript, CSS, and HTML to reduce file size and improve website performance.
Why Minify Your Code?
Free Online Code Minifier
Instantly minify JavaScript, CSS, and HTML code to reduce file size and boost website performance. Fast, private, and works entirely in your browser. No uploads to server—your code stays secure and confidential. Perfect for developers, webmasters, and anyone optimizing web assets.
How to Minify Your Code in 4 Easy Steps
Select Code Type
Choose JavaScript, CSS, or HTML from the tabs above the editor.
Paste or Upload
Paste your code or upload a file using the upload button.
Configure & Minify
Adjust advanced options if needed, then click "Minify Code".
Copy or Download
Copy the minified code or download it as a file for your project.
Supported Code Types & Features
JavaScript Minifier
Minify ES6+ JavaScript using Terser. Options for mangling, removing console calls, and beautifying output.
CSS Minifier
Minify CSS with clean-css. Choose optimization level and whether to keep important comments.
HTML Minifier
Minify HTML with html-minifier-terser. Remove comments, collapse whitespace, and minify inline CSS/JS.
Key Features of Our Code Minifier
Completely Private
Your code is never sent to our servers. All minification happens on your own computer.
Blazing Fast
No uploads or downloads from a server—minification is instant and secure.
Advanced Options
Fine-tune minification with options for each code type, including mangling, comment removal, and more.
Real-Time Stats
See original and minified size, reduction amount, and percentage saved instantly.
Download & Copy
One-click copy and download for your minified code, ready for production use.
No Registration
Free to use, no sign-up required, and no ads or tracking.
Understanding Code Minification
What is Minification?
Minification removes all unnecessary characters from code (like whitespace, comments, and newlines) without changing its functionality. This results in smaller files and faster load times.
function add(a, b) {
// Add two numbers
return a + b;
}function add(a,b){return a+b}Why Minify Code?
Minified code loads faster, saves bandwidth, and improves SEO. It’s a best practice for all production websites and web apps.
Frequently Asked Questions
Is this code minifier safe to use?
Absolutely. All minification happens in your browser. Your code is never uploaded or stored anywhere.
What libraries does this tool use?
We use Terser for JavaScript, clean-css for CSS, and html-minifier-terser for HTML—industry-standard libraries trusted by developers worldwide.
Will minifying my code break it?
For well-structured code, minification is safe. Always test your minified code before deploying to production.
What’s the difference between minification and GZIP?
Minification reduces file size by removing unnecessary characters. GZIP is a server-level compression applied during transmission. Use both for best results.
Can I minify multiple files at once?
Currently, our tool processes one file at a time for optimal accuracy. For batch minification, process files individually.
Technical Information
Processing
- • All minification happens in your browser
- • No code is sent to external servers
- • Real-time minification with web workers
- • Supports JavaScript, CSS, and HTML
- • Advanced optimization options
Browser Compatibility
- • Works on all modern browsers
- • Chrome, Firefox, Safari, Edge
- • Mobile-friendly responsive design
- • Dark mode support
- • Web worker support for performance
Privacy & Security
Your code privacy is our top priority. Our minifier tool processes all code locally in your browser, ensuring that your source code never leaves your device. We don't collect, store, or transmit any of your code.