JavaScript Compressor - Advanced Compress JavaScript Online
Free online JavaScript compressor tool with advanced compression levels to optimize and reduce JavaScript file size for production.
JavaScript Compressor
Aggressively compress JavaScript code for maximum size reduction
Input
Compressed Output
Compressed code will appear here
Paste JavaScript in the input area
How to Compress JavaScript - Step by Step Guide
Input Your JavaScript Code
Let's get your JavaScript code into the compressor! You have several convenient options:
Example: Uncompressed JavaScript Input
Here's JavaScript code before compression:
function processData(data) { const result = []; for (let i = 0; i < data.length; i++) { result.push(data[i] * 2); } return result; }
Advanced Compression Algorithm
The compressor applies advanced optimization instantly! The tool automatically:
Example: Compressed Output
The same code, now heavily compressed:
function processData(a){const b=[];for(let c=0;c<a.length;c++)b.push(a[c]*2);return b}
File size reduced by approximately 70%
Choose Compression Level
Select the compression level that fits your needs:
Export Compressed Code
Get your highly optimized JavaScript ready for production:
Frequently Asked Questions
What's the difference between compression and minification?
While minification removes comments and whitespace, compression goes further by optimizing code structure and shortening variable names for maximum file size reduction. Compression typically achieves 10-20% better results than standard minification.
Is compressed code safe to use in production?
Yes, the compressor preserves all code functionality while reducing file size. However, always test compressed code thoroughly before deploying to production, especially with advanced compression levels.
Can I debug compressed JavaScript?
Debugging compressed code is difficult due to shortened variable names. Always keep your original source code for development. Use source maps or our JavaScript Beautifier to make compressed code more readable when debugging.
How much file size reduction can I expect?
Compression typically reduces file size by 50-80% depending on your code style and the compression level chosen. Code with longer variable names, extensive comments, and formatting will see the greatest size reduction.
Should I compress all JavaScript files?
Compress JavaScript files for production to reduce bandwidth and improve loading times. Keep uncompressed versions for development. Consider using compression for any JavaScript file larger than 10KB for optimal performance gains.
Is the JavaScript compressor completely free?
Yes, totally free with no limitations on file size, usage frequency, or compression levels. No registration required, and you can compress unlimited JavaScript files with detailed compression statistics.