100% Client-Side

JavaScript Minifier

Free online JavaScript minifier and formatter. Minify JS by stripping comments and whitespace, or re-format with proper indentation. Shows size reduction stats. — runs 100% in your browser, client-side only. No data is sent to any server. Free to use, no account required.

Free Client-Side No Login No Storage
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How to Use the JavaScript Minifier

  1. Paste your JavaScript.
  2. Choose Minify or Format mode.
  3. Click the action button.

Minifies JavaScript by stripping comments and collapsing whitespace. Preserves license comments (/*!). For production, consider Terser or esbuild.

What is JavaScript Minifier?

A JavaScript minifier removes whitespace, comments, and shortens variable names to reduce file size without changing functionality. Minified JS loads faster and reduces bandwidth.

Why Use This Tool

Smaller JavaScript files mean faster page loads and better Core Web Vitals scores. Minification is a standard production build step for web performance optimization.

When to Use It

Use JS minification when preparing JavaScript for production deployment, optimizing page load performance, or reducing bundle sizes.

Who Should Use It

Frontend engineers, performance teams, and release pipelines shipping production assets.

How to Use the JavaScript Minifier

  1. Paste source JavaScript
  2. Run minifier and review size delta
  3. Smoke-test output in staging
  4. Deploy with source maps for debugging

Security note

Minification does not protect secrets. Never ship private keys, credentials, or tokens in client-side bundles.

Common Uses

  • Preparing JavaScript for production
  • Optimizing page load times
  • Reducing bundle sizes

Frequently Asked Questions

What's the typical size reduction?

Usually 30-60% reduction for well-commented code. The more comments and whitespace in the original, the greater the reduction.

Can I still debug minified code?

Use source maps. They map minified code back to original source, enabling debugging. Generate source maps during your build process.

Is this the same as obfuscation?

No. Minification preserves functionality while reducing size. Obfuscation intentionally makes code hard to understand for intellectual property protection.