ES6 to ES5 Transpiler | Convert Modern JavaScript
Transpile modern JavaScript (ES6/ES2015+) to ES5 for legacy browser support. Converts arrow functions, classes, template literals, destructuring, and more. Uses Babel for accurate transformation. Fast, private, and 100% in-browser.
How to Use This Tool
- 1
Paste or type your ES6+ JavaScript code into the input area.
- 2
The tool automatically transpiles to ES5-compatible code.
- 3
Review the transpiled output to see how modern features are converted.
- 4
Copy or download the ES5 code for use in legacy environments.
- 5
Test the output in older browsers or environments requiring ES5.
Use Cases & Examples
Legacy Browser Support
Convert modern JavaScript to ES5 for compatibility with IE11 and older browsers.
Understanding Babel Transformations
See how Babel converts ES6+ features to ES5 equivalents for learning purposes.
Quick Compatibility Checks
Test how your modern JavaScript will be transpiled before setting up build tools.
Polyfill-Free Code
Generate ES5 code that works without requiring polyfills for basic syntax features.
ES6 to ES5 Transpilation
Uses Babel with env preset to transform ES6+ syntax to ES5-compatible code.
Converts arrow functions to function expressions, classes to prototypes, and template literals to string concatenation.
Handles destructuring, spread operators, const/let to var, and other modern features.
Note: Only transforms syntax; runtime features (Promise, Map, Set) require polyfills.
Frequently Asked Questions
Q.What ES6+ features can this tool convert?
A. Arrow functions, classes, template literals, destructuring, spread/rest operators, const/let, default parameters, and more. Syntax features are fully converted; runtime features (Promise, Map) require polyfills.
Q.Will this work for TypeScript or JSX?
A. No. This tool transpiles standard JavaScript only. TypeScript and JSX require their own compilers (tsc for TypeScript, Babel with React preset for JSX).
Q.Do I still need polyfills after transpiling?
A. Yes, for runtime features like Promise, Map, Set, Array.from, etc. This tool only converts syntax. Use core-js or similar polyfill libraries for runtime features.
Q.Is this the same as Babel?
A. Yes, this tool uses Babel's env preset. It's perfect for quick tests, but for production, integrate Babel into your build process for better control.
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