JavaScript Minifier
Minify JavaScript for smaller distribution files by compressing expressions, shortening local names, and removing comments.
Parse, compress, and mangle JavaScript locally. Keep a readable original and test the output before deployment.
Processing happens in this browser. Your input is not uploaded or saved.
🔒 All processing happens in your browser — files never leave your device. Your input stays in this browser and is not uploaded to Smart Online Tools.
How it works
- Paste JavaScript source code.
- Select Minify JavaScript.
- Copy the output and test it in your application.
Good to know: Minification can change behavior in code that depends on function or class names, reflection, or specific build settings. Keep the original source and test the result.
Privacy and processing
All processing happens in your browser — files never leave your device. Your input stays in this browser and is not uploaded to Smart Online Tools.
What minification changes
This tool uses Terser to parse JavaScript, compress code, and mangle local identifiers. It does not run the input. The output is intended for a production bundle, while readable source should remain in version control.
Some applications rely on function names, class names, property names, or particular module settings. Test minified output with your own build and source-map workflow before publishing it.
Frequently asked questions
What does JavaScript Minifier do?
Compress and mangle JavaScript code in your browser. Minify JavaScript for smaller distribution files by compressing expressions, shortening local names, and removing comments.
Does this tool upload my files or input?
Your input stays in this browser and is not uploaded to Smart Online Tools.
What should I know before using this tool?
Minification can change behavior in code that depends on function or class names, reflection, or specific build settings. Keep the original source and test the result.