JSONToTable

JavaScript Minifier

Compress and minify JavaScript code to reduce file size

Input

Loading editor...

Output

Minified JavaScript will appear here

Paste JavaScript in the input area to get started

How to Minify JavaScript - Step by Step Guide

Step 1

Input Your JavaScript Code

Let's get your JavaScript code into the minifier! You have several convenient options:

•
Paste directly: Copy your JavaScript code and paste it into the input editor
•
Upload a file: Click "Upload" to select a .js or .txt file from your computer
•
Try the sample: Click "Sample" to load example code and see how minification works

Example: Unminified JavaScript Input

Here's readable JavaScript with comments and whitespace:

// Calculate total price
function calculateTotal(items) {
  let total = 0;
  for (let i = 0; i < items.length; i++) {
    total += items[i].price;
  }
  return total;
}
Step 2

Automatic Minification & Compression

The minifier compresses your code instantly! As soon as you input JavaScript, the minifier automatically:

•
Removes comments: All single-line and multi-line comments are stripped out
•
Removes whitespace: Unnecessary spaces, tabs, and line breaks are eliminated
•
Preserves functionality: Code logic remains exactly the same, just more compact

Example: Minified Output

The same code, now compressed and minified:

function calculateTotal(items){ let total=0; for( let i=0;i<items.length;i++){total+=items[i].price;} return total;}

File size reduced by approximately 60%

Step 3

Review Compression Results

See how much smaller your code became! The minifier shows you the compression ratio:

•
Compression percentage: See exactly how much file size was reduced
•
Before and after sizes: Compare original and minified file sizes in bytes
•
Real-time updates: Compression stats update automatically as you edit
Step 4

Export Your Minified Code

Get your optimized JavaScript ready for production! Multiple export options make deployment easy:

•
Copy to clipboard: One-click copying for quick deployment
•
Download as file: Save minified code as a .js file for your project
•
Production ready: Minified code is ready for immediate use in production

Frequently Asked Questions

What is JavaScript minification?

JavaScript minification is the process of removing all unnecessary characters from source code without changing its functionality. This includes removing whitespace, comments, and line breaks to reduce file size and improve page loading performance.

Does minification affect code functionality?

No, minification only removes unnecessary characters. Your code's logic and functionality remain exactly the same. The minified code will execute identically to the original code in any JavaScript environment.

Should I minify JavaScript for production?

Yes, it's a best practice to minify JavaScript files before deploying to production. This reduces file sizes by 30-60%, resulting in faster page loads, reduced bandwidth costs, and better user experience. Keep the original source code for development and debugging.

Can I reverse minification?

Minification is reversible in terms of making code readable again using a JavaScript Beautifier, but you'll lose the original comments and formatting. Always keep a copy of your original source code before minification for development purposes.

What's the difference between minification and obfuscation?

Minification focuses on reducing file size while keeping code readable (though compact). Obfuscation intentionally makes code difficult to understand by renaming variables and functions to protect intellectual property. For code protection, use our JavaScript Obfuscator.

Is the JavaScript minifier completely free?

Yes, totally free with no limitations on file size, usage frequency, or features. No registration required, and you can minify unlimited JavaScript files with detailed compression statistics.