JavaScript Minifier
Minify JavaScript by removing whitespace and comments
Input
Minified Output
What is JavaScript Minifier?
Need to shrink your JavaScript file size? JavaScript Minifier removes all unnecessary whitespace, line breaks, and comments from your JavaScript code. Perfect for production environments where smaller file sizes mean faster page loads and better performance.
According to MDN Web Docs, minified JavaScript is functionally identical to formatted JavaScript but takes up significantly less space. Our minifier preserves all your code functionality while removing everything unnecessary. Great for production deployments, CDN hosting, or any scenario where file size matters.
Everything happens in your browser – your code never leaves your computer. Minify, download, and use your compact JavaScript right away.
What Makes This Tool Different
Whitespace Removal
Removes all unnecessary spaces, tabs, and line breaks. Your JavaScript becomes a single compact line while staying perfectly valid and functional.
Comment Removal
Strips out all comments (single-line and multi-line) to reduce file size further. Comments aren't needed for execution, so removing them saves space.
Code Preservation
All your code logic stays intact. Functions, variables, and functionality remain exactly the same – just without the formatting.
File Upload Support
Got a big file? Just upload it. Works great for minifying those massive JavaScript libraries or application files without copy-pasting.
Download Minified JS
One click to download your minified JavaScript file. Perfect for production deployments where smaller files mean better performance.
Syntax Validation
We validate your JavaScript before minifying. Invalid code gets caught early, so you know the minified version will work correctly.
How It Works
Paste or Upload JavaScript
Paste your JavaScript code into the left editor, or click "Upload" to load a file. You can also click "Sample" to see an example. The tool accepts any valid JavaScript code.
Automatic Minification
As soon as you paste, the minifier processes your JavaScript and displays the compact version on the right. All whitespace and comments are removed, making it much smaller while staying valid.
Download or Copy
Click "Download" to save the minified JavaScript file, or "Copy" to copy it to your clipboard. The minified code is ready to use in production or wherever you need compact JavaScript.
When You'd Actually Use This
Production Deployment
Minify JavaScript files before deploying to production. Smaller files mean faster loading times, reduced bandwidth usage, and better user experience.
Performance Optimization
Reduce file sizes to improve page load speeds. Every kilobyte saved helps, especially on mobile devices or slow connections.
CDN Hosting
Save bandwidth costs by minifying JavaScript before uploading to CDNs. Smaller files transfer faster and cost less to serve.
Bundle Optimization
Minify JavaScript bundles to reduce overall application size. Works great with build tools or as a standalone step in your deployment pipeline.
Common Questions
Is my JavaScript code stored?
Nope. Everything happens right in your browser. Your code never leaves your computer – we don't even see it.
Does minification break my code?
No. Minified JavaScript is functionally identical to formatted JavaScript. All your code logic stays exactly the same – we just remove whitespace and comments.
How much smaller does it get?
It depends on how much whitespace and comments your code has. Typically, you'll see 30-60% size reduction, sometimes more for heavily commented code.
Can I format it back?
Yep. Use our JavaScript Formatter to make minified JavaScript readable again. Minification is reversible – formatting just adds whitespace back.
What about string literals?
String literals are preserved exactly as they are. We only remove whitespace between code elements, not content inside strings.
Does it work with large files?
Yep. Since everything happens in your browser, it depends on your device. Small files minify instantly. Very large files (several MB) might take a few seconds, but they'll still work.
Other JavaScript Tools You Might Need
Minification is just one JavaScript task. Here are other tools that work well together:
Need to learn more about JavaScript? Check out the comprehensive guide on MDN or the official ECMAScript specification.