JS Minifier

Minify JavaScript by removing comments, whitespace, and redundant syntax. Compare sizes to see your savings. Free, instant, 100% private.

About JS Minification

JavaScript minification reduces file size by removing unnecessary characters without changing functionality:

  • Comment removal: Strips both single-line (//) and multi-line (/* */) comments
  • Whitespace optimization: Collapses spaces, tabs, and newlines while preserving string contents
  • Syntax compaction: Removes unnecessary semicolons and whitespace around operators
  • Safe processing: String literals and template literals are preserved correctly
Note: This basic minifier removes comments and whitespace only. For production use, consider Terser, esbuild, or a full build tool for variable renaming and deeper optimization.

All processing happens in your browser. Your code never leaves your device.

About JS Minifier

Remove comments, collapse whitespace, and optimize JavaScript code structure. Compare original and minified sizes instantly. All processing happens in your browser — your code never leaves your device.

Comment Removal

Strips both single-line (//) and multi-line (/* */) comments. Reduces file size significantly without altering behavior.

Whitespace Optimization

Removes unnecessary spaces, tabs, and newlines while preserving string literals and template literals.

Size Comparison

See exact byte savings and compression ratio. Track minification effectiveness with original vs minified stats.

Safe Browser Processing

All minification happens in your browser. No server uploads. Your JavaScript code stays completely private.

📋 Common Use Cases

Production Deployment

Minify CSS, JavaScript, and HTML files before deploying to production. Smaller files load faster and consume less bandwidth for users.

Build Pipeline Integration

Quickly minify individual files during development to test production behavior. Verify that minification doesn't break functionality.

Performance Optimization

Reduce total page weight by minifying inline styles and scripts. Combine with compression for maximum size reduction.

Code Size Analysis

Compare original vs minified file sizes. Identify which files benefit most from minification and track optimization progress.

🪜 How to Use This Tool

  1. Paste your source code
    Enter CSS, JavaScript, or HTML into the input area. Most minifiers accept raw code or file uploads.
  2. Configure minification level
    Choose aggressive or safe minification. Some tools let you preserve specific comments, license headers, or debug information.
  3. Review minified output
    See the compressed code and size reduction statistics — original size, minified size, and percentage saved.
  4. Copy or download
    Copy minified code to replace your source in production, or download as a .min file to serve alongside your original.

📚 Related Guides

Frequently Asked Questions

Are these dev tools free?▼
Yes. All dev tools are completely free. No signup, no account.
Is my data sent to a server?▼
No. Base64 encoding, URL encoding, JWT decoding, hash generation, and regex testing all happen in your browser. Your tokens and secrets stay on your device.
Can I decode JWTs safely?▼
Yes. JWT decoding happens entirely in your browser. The token never leaves your device. Only the header and payload are decoded — signatures are not verified server-side.