JavaScript Code Compressor

Minify and compress your JavaScript code for better performance

Drop your JavaScript file here or click to browse

Supports .js files up to 10MB

Original Code
Compressed Code
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Size Reduction

CodeCompress Pro helps you compress and minify JavaScript in seconds. Smaller JS files load faster, reduce bandwidth, and improve Core Web Vitals like Largest Contentful Paint (LCP). Whether you are optimizing a single snippet or a full bundle, our tool keeps your code working while removing unnecessary whitespace and comments.

Why compress JavaScript?

Minifying scripts reduces file size without changing behavior. This means quicker page loads, better SEO, and lower costs for users on slower networks or mobile devices. It also helps your caching and CDN strategy by shipping lean assets.

How to use this JS compressor

  1. Paste your code into the "Original Code" editor or drop a .js file.
  2. Select Basic for safe whitespace and comment removal, or Advanced for deeper minification.
  3. Click Compress JavaScript to generate a minified version instantly.
  4. Copy or download the result and deploy it to your site.

Best practices and tips

  • Keep original source maps for easier debugging in production.
  • Test advanced minification on staging before shipping to users.
  • Combine compression with HTTP caching and a CDN for maximum gains.
  • Use tree-shaking via your bundler to remove unused code.

Frequently asked questions

Is JavaScript compression safe for my code?

Yes. Basic mode removes whitespace and comments without altering behavior. Advanced mode applies more aggressive rules that are safe for standard syntax; however, always test complex builds before production.

What is the difference between Basic and Advanced?

Basic focuses on readability-preserving minification. Advanced reduces characters further (e.g., tighter formatting) for the smallest possible output. Choose based on your risk tolerance and testing workflow.

Do you store my code?

No. Your code is processed securely and the result is provided for immediate copy or download. We do not retain the contents you submit.

Can minification break my JavaScript?

Minification doesn’t change logic, but it can expose syntax issues. If you see problems, try Basic mode, review transpilation settings (Babel/TypeScript), and ensure compatible bundler configurations.