How to Convert ES6 Code to ES5 (Step-by-Step Guide)
Do you have modern ES6 JavaScript code that doesn't work in older browsers? Don't worry — in this guide, we'll show you the easiest way to convert your ES6 code to ES5 in just a few seconds. You can perform instant conversion through your browser without any setup required.
🚀 Ready to Convert? Try It Now!
Skip the reading and start converting your ES6 code instantly:
Open ES6 to ES5 Converter →🎯 Why Convert ES6 to ES5?
Before we dive into the how-to, let's quickly understand why you might need ES5 instead of ES6:
- 1 Legacy browser support — IE11, older Android browsers
- 2 Corporate environments — Companies with outdated systems
- 3 Third-party integrations — Widgets, embeds, and external scripts
- 4 Maximum compatibility — When you need 100% browser coverage
📋 Step-by-Step Conversion Process
Open the ES6 to ES5 Converter
Navigate to our free online converter tool. No registration, no downloads, no setup required.
Direct Link:
https://es6-to-es5.vercel.app💡 Pro Tip: Bookmark this page for quick access whenever you need to convert ES6 code!
Paste Your ES6 Code
Copy your ES6 JavaScript code and paste it into the left input area. Here's an example of ES6 code you might want to convert:
// ES6 Example Code
const users = [
{ name: 'Alice', age: 25 },
{ name: 'Bob', age: 30 }
];
// Arrow function with destructuring
const getAdultUsers = () => {
return users.filter(({age}) => age >= 18)
.map(user => `${user.name} (${user.age})`);
};
// Class with constructor
class UserManager {
constructor(users) {
this.users = users;
}
addUser(user) {
this.users = [...this.users, user];
}
}
// Template literals
const greeting = (name = 'World') => {
console.log(`Hello, ${name}! Welcome to ES6.`);
};✅ Supported Features: Arrow functions, classes, template literals, destructuring, spread operator, default parameters, const/let, and more!
Choose Your Conversion Option
Our tool offers three conversion modes to suit different needs:
ES6 to ES5
Standard transpilation only
Minify
Convert + reduce file size
Deep Minify
Maximum compression
💡 Recommendation: Use "ES6 to ES5" for development and testing, "Minify" for production deployments.
Click Convert & Get ES5 Output
Click your preferred conversion button. The tool instantly processes your code using Babel.js transpiler technology. Here's what the converted output looks like:
// ES5 Converted Output
var users = [
{ name: 'Alice', age: 25 },
{ name: 'Bob', age: 30 }
];
// Arrow function converted to regular function
var getAdultUsers = function getAdultUsers() {
return users.filter(function(user) {
var age = user.age;
return age >= 18;
}).map(function(user) {
return user.name + ' (' + user.age + ')';
});
};
// Class converted to function constructor
var UserManager = function UserManager(users) {
this.users = users;
};
UserManager.prototype.addUser = function addUser(user) {
this.users = this.users.concat([user]);
};
// Template literals converted to string concatenation
var greeting = function greeting(name) {
if (name === undefined) name = 'World';
console.log('Hello, ' + name + '! Welcome to ES6.');
};✨ Notice: All modern ES6 features are converted to ES5-compatible equivalents that work in older browsers!
Copy & Use Your ES5 Code
Click the "Copy Code" button in the output area to copy your converted ES5 code to the clipboard. Now you can use it in:
- Legacy browser environments
- Production websites with broad browser support
- Third-party integrations and widgets
- Corporate environments with strict browser policies
🎉 That's it! Your ES6 code is now compatible with virtually every JavaScript environment, including Internet Explorer 11 and older mobile browsers.
🔍 Advanced Tips & Best Practices
⚡ Performance Tips
- • Use "Deep Minify" for production files
- • Convert only when needed for older browsers
- • Test converted code in target browsers
- • Keep original ES6 code for development
🔒 Privacy & Security
- • All processing happens in your browser
- • No code is sent to external servers
- • No registration or data collection
- • Safe for confidential projects
🚨 Common Issues & Solutions
Issue: "Unexpected token" error
Solution: Make sure your ES6 code is syntactically correct before conversion. Check for missing semicolons, brackets, or quotes.
Issue: Converted code still doesn't work in IE11
Solution: Some features like Promises, fetch(), or Object.assign() need polyfills. Consider using a polyfill service or library.
Issue: Code becomes too large after conversion
Solution: Use the "Deep Minify" option to reduce file size, or consider splitting large files into smaller modules.
🧭 What's Next?
Now that you know how to convert ES6 to ES5, here are some next steps to improve your JavaScript workflow:
Learn More
Explore our other JavaScript tutorials and guides
Automate
Set up Babel in your build process for automatic conversion
Test
Always test your converted code in target browsers
Ready to Convert Your ES6 Code?
Use our free ES6 to ES5 converter now and make your JavaScript compatible with all browsers in seconds.
Start Converting Now →✅ Summary
Converting ES6 to ES5 doesn't have to be complicated. With our free online tool, you can:
- Convert instantly — No setup or installation required
- Support all ES6 features — Arrow functions, classes, template literals, and more
- Choose output format — Standard, minified, or deeply compressed
- Maintain privacy — All processing happens in your browser
Ready to ensure your JavaScript works everywhere? Try the converter now →