JavaScript Minifier

Compress, optimize, and mangle your JavaScript code instantly.

Reduce file sizes for faster page loads by stripping comments, removing whitespace, and optimizing variables securely in your browser.

100% client-side • Powered by Terser API

Example:

Mangle Variables Drop Console Logs Keep Comments

JavaScript Input

Output

Minification Statistics

Original Size

0 B

Minified Size

0 B

Size Saved

0.00%

3-Step Process

How to Minify JavaScript

Compress your code securely and quickly without leaving your browser.

Paste Your Code

Copy and paste your raw, uncompressed JavaScript code into the left editor pane, or try one of the predefined examples.

Configure Options

Toggle settings like variable mangling to rename long variables to single letters, or choose to strip out `console.log` statements automatically.

Minify & Export

Click Minify. Once processed, you can copy the optimized code to your clipboard or download it directly as a `.min.js` file.

Why Minify JavaScript?

Minification is the process of removing all unnecessary characters from source code without changing its functionality. This includes stripping out whitespace, newlines, comments, and block delimiters.

Key Benefits

Faster Page Loads

Smaller file sizes mean browsers can download, parse, and execute your scripts much faster, dramatically improving your website's Time to Interactive (TTI).

Bandwidth Savings

Minified code can reduce script size by up to 60-80%. For high-traffic sites, this equates to significant reductions in CDN and hosting bandwidth costs.

Obfuscation (Mangling)

Mangling rewrites variable and function names into single letters (e.g., changing `calculateTotal()` to `a()`), making the code harder to reverse-engineer.

Stripping Dead Code

Advanced minifiers evaluate code paths and remove unreachable blocks, debug statements, and empty functions automatically.

Got Questions?

Frequently Asked Questions

1. What engine does this minifier use?

This tool utilizes Terser, the industry standard JavaScript parser, mangler, and compressor toolkit. It is the same engine used under the hood by modern bundlers like Webpack, Rollup, and Vite.

2. Will minifying break my JavaScript code?

Generally, no. Minification preserves the exact execution logic of your code. However, if your code relies on functions using Function.prototype.toString() or expects specific variable names that get mangled, you may encounter issues. Ensure your code has proper syntax before minifying.

3. What does "Mangle Variables" do?

Mangling analyzes your code's scope and renames local variables and function names to the shortest possible strings (usually single letters like a, b, c). This drastically reduces file size while keeping logic intact. It does not alter globally scoped variables or properties to prevent breaking external API calls.

4. Is my code uploaded to your servers?

No. Just like our other tools, the JavaScript Minifier runs entirely client-side. The Terser library is loaded into your browser, and all code compression happens locally on your device. Your proprietary code is completely safe.