Free Best Javascript Minifier Online - Compress & Optimize JS Code

Advanced JavaScript Minifier - Fast, Private, In‑Browser

Safe minify built-in. Toggle Advanced Mode for Terser-powered compression and mangling. All client-side.

Strip comments Collapse whitespace Keep line breaks Preserve /*! license */ Remove console/debugger Auto‑minify on input

Advanced Mode (Terser)

Mangle names Mangle top‑level Aggressive compress Keep fn/class names ES Module ECMA: ES5 (max compatibility) ES2015 ES2020 ES2022 Advanced mode loads Terser only when used to keep the page lightweight.

Original

Lines: 0 Chars: 0

Drop .js file to load

// Sample JavaScript code function calculateTotal(items) { let total = 0; // Calculate the sum of all items for (let i = 0; i < items.length; i++) { total += items[i].price; } return total; } const products = [ { name: "Product 1", price: 10 }, { name: "Product 2", price: 20 }, { name: "Product 3", price: 30 } ]; console.log("Total: $" + calculateTotal(products));

Minified

Lines: 0 Chars: 0

Compression 0%

Bytes saved 0 B

Time 0 ms

Minifying…

Done

JavaScript Minifier FAQs

What is JavaScript minification?

It removes unnecessary characters (comments, extra whitespace) without changing how the code runs, reducing file size for faster loads.

Is this tool safe and private?

Yes. Everything runs in your browser. Your code never leaves your device.

Will minification hurt debugging?

Minified code is harder to read. Use unminified code during development and minify for production. Consider source maps for debugging.

How much can I save?

Typical savings range from 20–80% depending on your code and selected options.

Does it mangle variable names?

In Advanced Mode, Terser can mangle names and compress aggressively. Use with tests for production builds.

Explore More Tools

• CSS Minifier
• HTML Minifier
• JSON Validator
• AI Prompt Maker
• WebP Image Converter
• Image Convert (Any Format)
• Free Keywords Generator
• GitHub Link Converter