Free online JavaScript minifier and compressor. Reduce JS file size by removing whitespace, comments, and simplifying syntax. Minify scripts for faster page loads and improved web performance scores. Supports ES6+ syntax and source maps. Essential for frontend developers. 100% browser-based.
100% browser-based — your data never leaves your device
Minify JavaScript code by removing whitespace, comments, and simplifying syntax.
Copy your JavaScript code and paste it into the input textarea above.
Press Minify to compress your code by removing whitespace, comments, and simplifying syntax.
Copy the minified JavaScript for production use. Check the size savings displayed below.
Drop a file here or click to browse
Ctrl+Enter to minify
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This tool compresses JavaScript by deleting whitespace and comments and optionally simplifying syntax, giving you a smaller file that behaves exactly like the original.
String literals, regex patterns, and template literals are preserved correctly, and all processing happens locally.
Script files are frequently the largest resources on a page, so shrinking them directly improves load time and performance metrics. This tool is the practical choice when you need a production-ready bundle without setting up a build pipeline: paste, minify, and deploy. For teams distributing code to CDNs, the compressed output also cuts transfer costs at scale.
The syntax simplification option delivers real savings on hand-written code, where verbose variable names and long comments inflate file size. Savings typically land between 30 and 60 percent depending on how the original was written, which adds up fast when the same script is fetched by thousands of visitors.
The script you are about to minify is the actual logic of your application, often including proprietary algorithms, configuration, and integration details. Sending it to a remote compressor hands a full copy of that code to an outside party.
Local minification keeps both the original source and the compressed result on your machine. Your application logic never leaves your device.
Copy your JavaScript code and paste it into the input textarea above.
Press Minify to compress your code by removing whitespace, comments, and simplifying syntax.
Copy the minified JavaScript for production use. Check the size savings displayed below.
Practical examples to help you get the most out of JavaScript Minifier:
Input:
function add(a, b) {
return a + b;
}
const result = add(5, 3);
console.log(result);
Output: function add(a,b){return a+b}const result=add(5,3);console.log(result);Input: // This is a comment const x = 42; /* another comment */ Output: const x=42;
Minification renames local variables and removes comments, which can break code that uses eval() or Function.prototype.toString(). Avoid these patterns in minified code.
Always test your minified JavaScript in target browsers. Some edge cases with string literals or regex patterns can behave differently after whitespace removal.
Whitespace, comments, and optionally shortens local variable names. The code logic is preserved identically.
Proper minification preserves all functionality. Strings, regex expressions, and template literals are handled correctly.
Minified code is optimized for size, not readability. Use the JavaScript Formatter to beautify minified code for editing.
Typical savings range from 30-60% depending on the original formatting, comment density, and variable name lengths.
Removes spaces, tabs, and newlines while preserving string literals and regex patterns.
Removes single-line and multi-line comments to reduce file size.
Optionally shortens variable names and simplifies boolean expressions.
Displays original vs minified size with byte savings and percentage.
JavaScript Minifier is useful in a variety of scenarios across different workflows:
Compressing JavaScript files for production websites and applications
Reducing script load times to improve page performance metrics
Preparing minified bundles for CDN deployment
When minifying for production, generate source maps so you can debug the original code in browser dev tools while serving the minified version to users.
Use this tool during development, but automate minification in your build pipeline with tools like Terser or esbuild for consistent results.
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