JavaScript Minifier
Minify your JavaScript code to reduce file size and boost page performance. Remove comments, whitespace, and unnecessary characters.
Features
Comment Removal
Strips single-line and multi-line comments while preserving string content that looks like comments.
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?▾
Basic minification that removes comments and whitespace is safe. The tool preserves string contents and code logic while removing only formatting.
Does this tool rename variables?▾
No. This performs basic minification only (comment and whitespace removal). For advanced minification with variable renaming and dead code elimination, use build tools like Terser.
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.