JS Minifier

JS Minifier

Compress & Optimize Your JavaScript — Instantly In Your Browser

Paste, upload, or combine multiple JavaScript files, choose your optimization options, and get production-ready minified output in one click. Supports ES6+ and all modern JavaScript syntax. Everything runs in your browser — your code never leaves your device.

🔒 Runs entirely in your browser — your code is never transmitted to any server

Loading Terser engine…

Options:

Strip Comments

Remove Whitespace

Mangle Variable Names Shortens variable & function names — disable if code is referenced externally

JS Input

📂 Upload JS File ➕ Add Files

Minified Output

Load Sample:

Compression Results

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Original

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Minified

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Saved

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Reduction

All minification runs locally in your browser. No JavaScript code you enter is ever transmitted to a server. Always keep a backup of your original source files.

How to Use the JS Minifier

Paste, Upload, or Add Multiple Files

Type or paste your JavaScript into the JS Input panel, click Upload JS File to load a single .js file, or click Add Files to queue multiple files for combined minification. Files are read entirely in your browser — nothing is sent to any server. When multiple files are queued, they are combined in the order listed before minification.

Choose Your Options

Three minification options are available: Strip Comments removes all // line and /* block */ comment types; Remove Whitespace collapses all spaces, tabs, and line breaks; Mangle Variable Names renames local variables and functions to the shortest possible identifiers for maximum compression. Mangling is off by default — enable it when your code is self-contained and does not expose named functions externally.

Click Minify JS

Press the Minify JS button. Your code is processed entirely in your browser and the compact result appears in the Minified Output panel. The Compression Results panel shows your original file size, the new size, bytes saved, and the percentage reduction.

Copy or Download

Click Copy to copy the minified JavaScript to your clipboard with one click, or click Download .min.js to save the compressed file directly to your computer as a .min.js file, ready for production deployment.

Frequently Asked Questions

What does a JS minifier do?

Is my JavaScript code stored on your servers?

What minification engine does this tool use?

What does the Mangle Variable Names option do?

Can I minify multiple JavaScript files at once?

Should I keep a copy of my original JavaScript?

How to Use the JS Minifier

Frequently Asked Questions

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