JavaScript Minifier Tool | Optimize & Compress JS Code

Free online JavaScript minifier tool. Reduce your JS file size with advanced optimization options. Improve website performance with our easy-to-use minifier. Supports presets, variable renaming, and dead code removal.

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// Advanced JavaScript minification example
class ShoppingCart {
  constructor() {
    this.items = [];
    this.taxRate = 0.08;
  }

addItem(product, price, quantity = 1) {
    this.items.push({ product, price, quantity });
    console.log(`Added ${quantity} ${product}(s) to cart`);
  }

calculateSubtotal() {
    return this.items.reduce((total, item) => 
      total + (item.price * item.quantity), 0);
  }

applyDiscount(percentage) {
    if (percentage > 0 && percentage <= 50) {
      const discount = this.calculateSubtotal() * (percentage / 100);
      return discount;
    }
    throw new Error('Invalid discount percentage');
  }

calculateTotal(discountPercentage = 0) {
    const subtotal = this.calculateSubtotal();
    const discount = discountPercentage > 0 ? 
      this.applyDiscount(discountPercentage) : 0;
    const tax = (subtotal - discount) * this.taxRate;
    return (subtotal - discount + tax).toFixed(2);
  }

displayCartSummary() {
    console.log('==== CART SUMMARY ====');
    this.items.forEach(item => {
      console.log(`${item.quantity}x ${item.product} - $${item.price.toFixed(2)} each`);
    });
    console.log('======================');
  }
}

// Create cart instance
const cart = new ShoppingCart();

// Add items to cart
cart.addItem('Laptop', 1200);
cart.addItem('Mouse', 25.99, 2);
cart.addItem('Keyboard', 89.50);

// Display summary
cart.displayCartSummary();

// Calculate total with discount
const total = cart.calculateTotal(15);
console.log(`Total with 15% discount: $${total}`);

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description Before Minification

Larger file size
Readable code structure
Full comments and documentation
Descriptive variable names
Whitespace for readability

bolt After Minification

Reduced file size
Optimized for fast loading
Removed comments and whitespace
Shorter variable names
Obfuscated logic

tune Minification Settings

Default

Aggressive

Safe Mode

code Basic Optimization

Remove Whitespace

Remove Comments

Collapse Variables

sync_alt Variable Renaming

Rename Variables

Rename Globals

Min Length:

Max Length:

delete Dead Code Removal

Remove Dead Code

Remove console.*

Remove debugger