JavaScript Minifier - Compress JS Code Online Free Tool
Minify and compress JavaScript code to reduce file size. Remove whitespace, comments, and optimize JS for faster website loading. Free JS minification tool.
JavaScript Minifier
Optimization Features
What Gets Removed
- • Single-line comments (//)
- • Multi-line comments (/* */)
- • Unnecessary whitespace and line breaks
- • Extra spaces around operators
- • Redundant semicolons
What Gets Preserved
- • String literals and their content
- • Regular expressions
- • Essential whitespace for syntax
- • Variable and function names
- • Code functionality and logic
⚠️ Important Notes
- • Always test minified code before deploying to production
- • Keep original source files for development and debugging
- • Consider using source maps for debugging minified code
- • This is a basic minifier - for production, consider tools like UglifyJS or Terser
- • Some advanced JavaScript features may require specialized minifiers
Smart Compression
Remove comments and whitespace while preserving functionality.
Faster Loading
Smaller JS files load faster and improve performance.
Safe Processing
All processing happens locally in your browser.
Compression Stats
See exactly how much space you saved.
Frequently Asked Questions
JavaScript minification is the process of removing unnecessary characters from JS code without changing its functionality. This includes removing whitespace, comments, and optimizing the code structure to reduce file size.
Minified JavaScript files are smaller, which means faster download times, reduced bandwidth usage, and improved website performance. This leads to better user experience and faster page load times.
When done correctly, minification should not break your JavaScript. However, some edge cases or syntax errors in the original code might cause issues. Always test minified code before deployment.
Compression ratios vary depending on your coding style. Well-commented and formatted JavaScript can often be compressed by 30-70%. The actual savings depend on the amount of whitespace and comments.
This tool is great for basic minification and learning. For production websites, consider using professional tools like UglifyJS, Terser, or build tools like Webpack that offer advanced optimization features.