Does minifying JS change behavior?

Correctly written JavaScript keeps behavior after minification; always test code that relies on exact spacing or eval.

Are source maps supported?

You can generate readable output separately; source map export can be added in future iterations.

Is my code sent to a server?

No. Processing runs locally so your proprietary code stays private.

JavaScript minifier | ToolsByte

Our advanced JavaScript Minifier uses Terser to compress your JavaScript code by removing whitespace, shortening variable names, and optimizing code structure. This results in significantly smaller files and faster script execution.

JavaScript Minification Benefits

Faster Downloads: Smaller JS files load much faster
Improved Performance: Less parsing time for JavaScript engines
SEO Benefits: Faster sites rank higher in search engines
Mobile Optimization: Critical for mobile users with limited bandwidth
Code Protection: Makes code harder to reverse engineer

Advanced Optimizations

Variable Mangling: Shortens variable and function names
Dead Code Removal: Eliminates unreachable code
Expression Optimization: Simplifies complex expressions
Whitespace Removal: Strips all unnecessary whitespace
Comment Stripping: Removes all comments for production

Ideal Use Cases

Web Applications

Compress JavaScript bundles for React, Vue, Angular, or vanilla JS applications before deployment.

Library Distribution

Create minified versions of JavaScript libraries for CDN distribution and npm packages.

Production Builds

Integrate into build pipelines for automatic JavaScript optimization in production environments.

JavaScript Minification Guide

✅ Recommended Practices:

• Keep original source files for development
• Use source maps for debugging minified code
• Test functionality after minification
• Bundle multiple files before minifying
• Enable tree shaking to remove unused code
• Use version control for minified files

❌ Avoid These Mistakes:

• Minifying code during development
• Not handling eval() and with statements properly
• Forgetting to test on different browsers
• Ignoring console errors after minification
• Not considering third-party dependencies
• Skipping performance testing

Performance Impact

JavaScript minification can reduce file sizes by 40-60% or more. This translates to faster page loads, better user experience, and improved Core Web Vitals scores for SEO.

Powered by Terser

Our JavaScript minifier uses Terser, the industry-standard JavaScript parser and compressor. Terser is trusted by major frameworks and build tools like Webpack, Rollup, and Parcel for production-grade JavaScript optimization.