Free JavaScript Minifier Online

Compress, optimize, and minify JavaScript code instantly. Remove whitespace, comments, and console.log statements for production.

Optimizes Secure Fast Client-Side Free Forever
Input JavaScript 0 B
Minified/Beautified JS 0 B
Configuration

How to Use the JavaScript Minifier

Compressing your JavaScript files is quick and easy with our free online JS minifier. Follow these simple steps:

  1. Paste your JavaScript code - Copy your JS code and paste it into the input field, or click "Load Sample" to try with example code.
  2. Configure minification options - Choose which optimizations to apply: remove comments, remove whitespace, remove console.log statements, shorten variables (basic), and mangle keys (experimental).
  3. Click "Minify JavaScript" - The minifier will process your code and display the compressed result with size reduction percentage.
  4. Or Beautify - Toggle the "Beautify" option to format minified code back to readable format with proper indentation.
  5. Copy or download - Click "Copy" to copy the result to your clipboard, or "Download" to save it as a .js file.
Privacy Guaranteed: All JavaScript minification happens 100% in your browser. Your code is never uploaded to any server - we can't see or store your scripts.

What is JavaScript Minification?

JavaScript Minification is the process of removing unnecessary characters from JavaScript code without changing its functionality. This includes removing whitespace, line breaks, comments, and optionally shortening variable names. The result is a smaller file that downloads faster and improves your website's performance.

What Gets Removed
  • Comments - // and /* */ comments
  • Whitespace - Spaces, tabs, line breaks
  • Console statements - console.log(), console.warn()
  • Unused code - Dead code elimination
  • Semicolons - Where optional (ASI)
What Gets Optimized
  • Variable names - longVariableName → a
  • Property access - object["prop"] → object.prop
  • Boolean shortcuts - true → !0, false → !1
  • String concatenation - Combined where possible
  • Dead code - Unreachable code removed

Benefits of Minifying JavaScript

JavaScript minification is essential for production websites. Here's why every developer should minify their scripts:

Faster Execution

Smaller JavaScript files parse and execute faster, reducing Time to Interactive (TTI).

Better Performance Scores

Improves Lighthouse, PageSpeed, and Core Web Vitals scores for better SEO ranking.

Mobile Optimization

Critical for mobile users on slower networks - smaller files mean faster loading.

Frequently Asked Questions About JavaScript Minification

Yes, basic minification is completely safe. Removing whitespace and comments doesn't affect functionality at all. Advanced features like variable shortening should be tested thoroughly, especially if you rely on specific variable names for external APIs or debugging.

Minification focuses on reducing file size by removing unnecessary characters while keeping code functional. Obfuscation intentionally makes code difficult to read and reverse-engineer to protect intellectual property. Minification is primarily for performance; obfuscation is for security.

Yes, for production code. Console statements add unnecessary bytes and can expose debugging information to users. They also have a small performance impact. Use our "Remove console.log" option to strip all console statements automatically.

Typical JavaScript minification reduces file size by 30-60%. With advanced features like variable shortening, you can see even greater reductions. Combined with Gzip compression on your server, total reduction can exceed 80%.

Yes! Toggle the "Beautify instead of Minify" option to format minified code. This adds proper indentation and line breaks to make the code readable. Note that variable names shortened during minification cannot be recovered - keep your original source files.

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