JavaScript Minifier
Note: This is a basic minifier that removes comments and whitespace. It does NOT rename variables or perform advanced optimizations. Always test your minified code thoroughly. For production use, consider professional tools like Terser or UglifyJS which offer more advanced optimizations.
About JavaScript Minifier
JavaScript minification reduces file size by removing unnecessary characters like whitespace and comments without changing code functionality. This improves page load times and reduces bandwidth usage. This tool provides basic minification by removing single-line (//) and multi-line (/* */) comments, collapsing whitespace, and removing spaces around operators. Unlike advanced minifiers, it does NOT rename variables or perform complex code transformations, making it safer but less aggressive. All minification happens in your browser for complete privacy.
How to Use
- Paste or type your JavaScript into the input field.
- The tool will automatically minify your code after a brief pause.
- Click "Minify" to manually trigger minification.
- View the size reduction statistics showing original size, minified size, and savings.
- Click "Copy" to copy the minified JavaScript to your clipboard.
- Test your minified code thoroughly before using in production.
Frequently Asked Questions
What is JavaScript minification?
JavaScript minification is the process of removing unnecessary characters (whitespace, comments, line breaks) from JavaScript code without changing its functionality. This reduces file size, leading to faster download times and improved page load performance.
What optimizations does this minifier perform?
This minifier removes single-line (//) and multi-line (/* */) comments, collapses multiple spaces into single spaces, removes whitespace around operators and punctuation, and preserves necessary spaces after keywords. It does NOT rename variables or perform advanced code transformations.
Will minification break my JavaScript?
This basic minifier is designed to be safe and should not break valid JavaScript code. However, always test your minified code thoroughly. Edge cases like regex patterns, template literals, or unusual syntax might require manual review. For production use, consider professional minifiers with better parsing.
Why doesn't this minifier rename variables?
Variable renaming (mangling) is complex and can easily break code if not done correctly. It requires understanding scope, preserving public APIs, and handling edge cases. This tool focuses on safe, basic minification. For variable renaming, use professional tools like Terser or UglifyJS.
How much size reduction can I expect?
Size reduction varies based on your code style. Code with many comments and whitespace typically sees 20-40% reduction. Code that's already compact will see less. Advanced minifiers with variable renaming can achieve 50-70% reduction. The statistics panel shows exact savings.
Should I minify JavaScript for production?
Yes! Minifying JavaScript is essential for production websites. It reduces bandwidth usage, improves page load times, and enhances user experience. Keep unminified versions for development and debugging. Most build tools (webpack, Vite, Rollup) include professional minifiers.
Can I use this for frameworks like React or Vue?
While you can minify any JavaScript, modern frameworks should be minified using their recommended build tools (webpack, Vite, etc.) which include advanced minifiers optimized for framework code. This tool is best for simple JavaScript or quick optimization of small scripts.
Is my code secure?
Yes! All JavaScript minification happens entirely in your browser. Your code is never sent to any server, ensuring complete privacy. The tool works offline once loaded. However, remember that minification is NOT obfuscation—your code logic remains readable.