JS Minifier
Reduce JavaScript file size by removing unnecessary whitespace, line breaks, and comments. Features compression rate display and download.
JS Minifier
What is JS Minifier?
JS Minifier (JavaScript Minifier) is a tool that reduces file size by removing unnecessary whitespace, line breaks, and comments from JavaScript code. The minified code works identically while being smaller in size, which improves web page loading speed.
Key Features
- Comment Removal – Removes both single-line (//) and multi-line (/* */) comments
- Whitespace Optimization – Removes unnecessary spaces, tabs, and line breaks
- String Protection – String literals and regex patterns are preserved intact
- Real-time Minification – Automatically displays results as you type
- Compression Rate Display – Shows the compression percentage compared to original
- Download – Save the minified code as a .min.js file
How to Use
- Paste the JavaScript code you want to minify in the left input area
- Minification starts automatically when code is entered
- View the minified result and compression rate on the right
- Click the copy button to copy to clipboard, or download button to save as a file
Tip: Click the ‘Sample’ button to test the tool with example code.
Why Minify JavaScript?
1. Faster Page Loading
Smaller file sizes mean faster download times, making web pages load quicker. This is especially effective on mobile networks.
2. Bandwidth Savings
Reduced data transfer from the server can lower hosting costs.
3. Better SEO
Google uses page loading speed as a ranking factor. Faster pages may achieve higher search rankings.
4. Improved User Experience
Fast-loading pages increase user satisfaction and reduce bounce rates.
Important Notes
- This tool performs basic minification (whitespace/comment removal) only
- For advanced optimizations like variable shortening and dead code elimination, use professional tools such as Terser or UglifyJS
- Always keep a backup of your original code before minification
- Test the minified code thoroughly before production deployment
Frequently Asked Questions
Does the code work properly after minification?
Yes, minification only removes whitespace and comments, so the code functionality remains identical. However, code with syntax errors will still have the same errors after minification.
What compression rate can I expect?
It varies by code, but typically heavily commented code can be reduced by 30-50%, while already concise code may see 10-20% reduction.
Can I reverse the minification?
Whitespace and line breaks can be restored using a Beautifier tool, but removed comments cannot be recovered. Always keep your original source code.
Can I minify TypeScript?
This tool is for pure JavaScript only. For TypeScript, first compile it to JavaScript, then minify the output.