JavaScript Minifier
Minify your JavaScript code to reduce file size and boost page performance. Remove comments, whitespace, and unnecessary characters.
Features
Comment Removal
Uses Terser parsing so comments are removed without corrupting strings, URLs, regexes, or template literals.
Size Comparison
See original and minified file sizes along with the percentage of space saved.
Private & Secure
All minification runs in your browser. Your JavaScript code is never uploaded or stored.
No Setup Required
Works in any modern browser on any device. No Node.js, npm, or CLI tools needed.
How It Works
Paste Code
Paste your JavaScript code into the input area or load a sample.
Click Minify
Press the Minify JS button to compress your code.
Use Output
Copy the minified JavaScript for use in production.
Frequently Asked Questions
How do I minify JavaScript online?▾
Paste your JavaScript code into the input area and click "Minify JS". The tool removes comments, extra whitespace, and unnecessary characters.
Will minifying break my JavaScript?▾
The tool uses Terser to parse your code before minifying, so it preserves code logic while removing comments and formatting.
Does this tool rename variables?▾
No. This performs parser-safe minification without variable renaming or dead code elimination.
How much smaller will my JS be?▾
Results vary, but you can typically expect 20-50% file size reduction depending on how many comments and how much whitespace your original code has.
Should I keep the original code?▾
Yes. Always keep your original, readable source code for development. Use the minified version only for production deployment.
Is this tool free?▾
Yes, the JavaScript Minifier is completely free with no usage limits, sign-up, or watermarks.