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JavaScript Minifier

⚙️ Minification Options
📝 Input JavaScript
Lines: 0 Size: 0 B
✅ Minified Output
Lines: 0 Size: 0 B

💡 Quick Examples - Click to Try

Basic Function
function calculate(x, y) { return x + y; }
Arrow Functions
const sum = (a, b) => a + b;
Async/Await
async function fetchData() { const response = await fetch(url); }
ES6 Class
class Person { constructor(name) { this.name = name; } }
⚡

Fast Compression

Reduce JavaScript file sizes by 40-80% through smart whitespace removal and code optimization.

🎯

Safe Minification

Preserves code functionality while removing comments, whitespace, and unnecessary characters.

🔧

Customizable Options

Control exactly what gets minified with options for comments, console logs, and debugger statements.

✨

Beautify & Format

Reverse minification to restore readable, properly indented JavaScript for maintenance.

📊

Size Analytics

Real-time statistics showing compression ratios, byte savings, and performance improvements.

🔐

Private Processing

All minification happens locally in your browser. Your code never leaves your device.

About Our JavaScript Minifier Tool

Supercharge your website performance with our advanced free online JavaScript minifier and compression tool built for modern web development workflows. JavaScript minification is essential for optimizing web applications, reducing bundle sizes, improving page load times, and enhancing user experience by removing unnecessary characters, comments, whitespace, and debug code while preserving complete functionality and ensuring cross-browser compatibility. Our powerful JavaScript minifier provides intelligent compression with comprehensive customizable options including removal of single-line and multi-line comments for cleaner production code, elimination of unnecessary whitespace, line breaks, tabs, and excessive spacing, optional removal of console.log, console.warn, console.error, and other debug statements, automatic removal of debugger statements that should never reach production, basic variable name shortening for additional size reduction, smart preservation of string literals and template strings to prevent breaking, handling of modern ES6+ syntax including arrow functions, destructuring, and spread operators, support for async/await patterns, promises, and modern JavaScript features, proper handling of regular expressions to avoid breaking patterns, and real-time compression statistics showing exact byte savings, percentage reduction, and performance impact for monitoring and optimization.

Frequently Asked Questions

What is JavaScript minification and why is it important?
JavaScript minification is the process of removing unnecessary characters from JavaScript code without changing its functionality.
Will minifying JavaScript break my code or cause errors?
Proper JavaScript minification should never break your code if the original code is syntactically correct. Our minifier preserves all functional code including variable scoping and closures, operator precedence and evaluation order, string literals and template strings, regular expression patterns, object properties and method calls, and modern ES6+ syntax.
How much file size reduction can I expect from JavaScript minification?
File size reduction varies significantly based on your code's original formatting and commenting style. Well-formatted code with proper indentation typically achieves 40-60% reduction, heavily commented development code can see 60-80% reduction, code with minimal comments and tight formatting may only achieve 20-35% reduction, framework libraries like React or Vue can see 50-70% reduction, and utility libraries with extensive documentation comments exceed 75% reduction.
Should I remove console.log statements when minifying for production?
Yes, you should always remove console statements from production JavaScript for several important reasons. Console statements create security risks by potentially exposing sensitive information, application logic, or API endpoints in browser developer tools.
Can I reverse JavaScript minification to make it readable again?
Yes, our tool includes a beautify feature that can restore basic formatting with proper indentation, line breaks, and spacing. However, beautification has significant limitations that you must understand: it cannot restore removed comments as those are permanently deleted during minification, it cannot restore original variable names if they were shortened (e.g., a stays a, not originalUserName), it cannot recover original code structure or developer intent, and complex minified code may not beautify perfectly due to aggressive optimizations.