JavaScript Transpiler - Transpile ES6+ to ES5 Online
Free online JavaScript transpiler to convert modern ES6+ code to ES5 for maximum browser compatibility.
JavaScript Transpiler
Convert modern JavaScript to browser-compatible code
Modern JavaScript Input
Transpiled Output
Transpiled code will appear here
Paste modern JavaScript in the input area
How to Transpile JavaScript - Step by Step Guide
Input Your Modern JavaScript
Let's transpile your modern JavaScript to ES5 for compatibility! You have several options:
Example: Modern ES6+ Input
Here's modern JavaScript with ES6+ features:
const greet = (name) => Hello, ${name}!; const {age, city} = { age: 25, city: "NYC" };
Automatic ES5 Transformation
The transpiler converts modern syntax instantly! It automatically transforms:
Example: Transpiled ES5 Output
The same code transpiled to ES5:
var greet = function(name) { return "Hello, " + name + "!"; }; var age = 25; var city = "NYC";
Verify Browser Compatibility
The transpiled code works in all browsers:
Export Transpiled Code
Get your browser-compatible JavaScript:
Frequently Asked Questions
What is JavaScript transpilation?
Transpilation is the process of converting modern JavaScript (ES6+) to older JavaScript (ES5) that works in all browsers, including older ones. It allows developers to write modern code while maintaining broad compatibility.
When should I transpile JavaScript?
Transpile when you need to support older browsers like Internet Explorer or older versions of mobile browsers. If you're targeting only modern browsers, you can skip transpilation and use native ES6+ features.
Does transpilation affect performance?
Transpiled code may be slightly larger and sometimes less efficient than native ES6+ code. However, the performance difference is usually negligible, and transpilation ensures your code works everywhere. Consider using compression for production.
What features can be transpiled?
Most ES6+ features can be transpiled including arrow functions, template literals, destructuring, classes, modules, async/await, and more. Some newer features may require polyfills for full functionality in older browsers.
Should I transpile for Node.js?
Modern Node.js versions (12+) support most ES6+ features natively. Transpilation for Node.js is usually unnecessary unless you're targeting older Node versions or need specific advanced features not yet implemented.
Is the JavaScript transpiler completely free?
Yes, totally free with no limitations on file size or usage frequency. No registration required, and you can transpile unlimited JavaScript files for maximum browser compatibility.