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JavaScript Minifier— Free & Private

Minify JavaScript code by removing whitespace, comments, and shortening syntax.

Processed in your browser. Nothing uploaded.

What Is JavaScript Minification?

JavaScript minification reduces the size of JS files by removing whitespace, comments, and unnecessary characters, and by shortening variable names where safe. Smaller JavaScript files load faster, parse quicker, and consume less bandwidth, directly improving your website's performance metrics. Our minifier operates entirely in your browser, ensuring your proprietary code never leaves your device.

How to Use JavaScript Minifier

  1. Paste your JavaScript

    Paste your JavaScript code into the input area or upload a .js file.

  2. Minify

    Click the Minify button to compress the code by removing all non-essential characters.

  3. Copy or download

    Copy the minified JavaScript to your clipboard or download it as a file.

Why Use Our JavaScript Minifier?

Runs entirely in your browser — source code never leaves your device
Removes whitespace, comments, and dead code
Shortens variable and function names safely
Improves page load speed and Lighthouse performance scores
Handles ES6+ syntax including arrow functions and template literals
Displays before-and-after file size comparison
No build tool setup or command-line knowledge required

Frequently Asked Questions

How much can JavaScript minification reduce file size?

Most JavaScript files see a 30% to 60% size reduction after minification. Files with extensive comments and verbose variable names benefit the most. Combining minification with gzip compression can reduce transfer size by over 80%.

Will minification break my JavaScript code?

The minifier preserves the functional behavior of your code. However, if your code relies on specific variable names at runtime (e.g., via eval or dynamic property access), name mangling could cause issues. You can disable name shortening if needed.

What is the difference between minification and obfuscation?

Minification focuses on reducing file size while maintaining readability of the logic if reformatted. Obfuscation intentionally makes code difficult to understand by renaming all identifiers to meaningless strings and adding control-flow transformations. This tool performs minification, not obfuscation.