JavaScript Minifier
Free JavaScript minifier online — compress JS code for production to reduce file size and improve website performance. No signup required.Minify JavaScript code for production use. Remove whitespace, comments, and shorten variable names. Works 100% in your browser.
About JavaScript Minifier
JavaScript minification is the process of removing unnecessary characters from JS code without changing its functionality. This reduces file size, leading to faster downloads and improved website performance. Minified JavaScript is harder to read, which also provides a basic level of code obfuscation for protecting intellectual property.
How to Use
- Paste your JavaScript code in the left panel.
- Adjust minification options (remove comments, whitespace, shorten variables).
- Click Minify to compress your JavaScript.
- View file size savings in the stats section.
- Use Copy to copy the minified JS or Download .js to save as a file.
Minification Features
- Removes single-line (//) and multi-line (/* */) comments
- Removes unnecessary whitespace and line breaks
- Optional basic variable name shortening
- Preserves string content and regular expressions
- Handles template literals correctly
- Maintains JavaScript functionality
Frequently Asked Questions
Why should I minify my JavaScript?
Minified JavaScript loads faster, improving page load times and user experience. Smaller files mean less bandwidth usage and reduced server costs. For high-traffic websites, even small file size reductions can lead to significant savings.
Is my JavaScript code kept private?
Yes, completely. All minification happens locally in your browser using JavaScript. No code is ever transmitted to any server or stored anywhere.
Will minification break my JavaScript?
Proper minification should not break functionality. However, certain coding patterns or eval() usage with dynamic variable names might be affected. Always test your minified code thoroughly before deploying to production.
What's the difference between minification and obfuscation?
Minification removes unnecessary characters to reduce file size. Obfuscation goes further by deliberately making code harder to understand through variable renaming, string encryption, and control flow flattening. This tool focuses on minification with basic variable shortening.
Should I use source maps?
Yes, for production debugging. Source maps map your minified code back to the original source, making it easier to debug issues in production environments. Generate source maps during your build process and keep them alongside your minified files.