Instantly transpile TypeScript to clean JavaScript. Remove type annotations, interfaces, enums & generics — no install, no sign-up required.
Everything you need to transpile TypeScript code accurately and efficiently, right in your browser.
Real-time TypeScript to JavaScript conversion powered entirely in the browser. No server roundtrips — your code never leaves your machine.
Choose your JavaScript target: ES3, ES5, ES2015 through ESNext. The converter adapts async/await, arrow functions, and class syntax accordingly.
Beautiful syntax highlighting for both TypeScript input and JavaScript output with colour-coded tokens for keywords, types, strings, and comments.
See exactly what changed. Enable Diff View to compare input and output side-by-side with colour-coded additions and removals at the line level.
Select CommonJS, ESM, AMD, or UMD module output. Automatically transforms import/export statements to match your chosen environment.
Optional one-click minification removes whitespace and comments to produce production-ready, compact JavaScript for deployment.
Real-time validation catches common TypeScript syntax issues before conversion — mismatched brackets, unclosed strings, and empty inputs.
Copy converted JavaScript to clipboard or download as a .js file instantly. Also supports drag-and-drop .ts file uploads.
Four steps to get clean JavaScript from your TypeScript source.
Paste your TypeScript code into the left panel, or click Upload to load a .ts / .tsx file directly from your system.
Choose your JS target version, module system, and toggle minification or comment removal to match your project requirements.
Hit the Convert button. The tool strips type annotations, interfaces, enums, generics, and access modifiers instantly.
Copy the JavaScript output to your clipboard or download it as a .js file ready to use in your project.
TypeScript has rapidly become the language of choice for professional JavaScript development. Created by Microsoft and first released in 2012, TypeScript adds a powerful static type system on top of JavaScript, enabling developers to catch bugs at edit time rather than runtime. But here's the thing: browsers and Node.js don't understand TypeScript natively. Every .ts file you write must be converted — or transpiled — into plain JavaScript before it can run. That's exactly what a TypeScript to JavaScript converter does.
When you convert TypeScript to JavaScript (TS to JS), the transpiler strips out all the TypeScript-specific syntax that doesn't exist in standard JavaScript. This includes type annotations like let age: number = 30, interfaces such as interface User { name: string; }, generic type parameters like function identity<T>(arg: T): T, enums, access modifiers (public, private, protected), and utility types. The resulting JavaScript is functionally identical — it behaves exactly as the TypeScript code intended, just without the compile-time safety net.
A quick example makes this concrete. In TypeScript you might write:
const greet = (user: { name: string; age: number }): string => `Hello ${user.name}, aged ${user.age}`;
After TypeScript-to-JS conversion, this becomes the clean, annotation-free JavaScript:
const greet = (user) => `Hello ${user.name}, aged ${user.age}`;
The type information is erased entirely — it existed only to help your editor and compiler catch mistakes. At runtime, JavaScript doesn't need it.
The official way to transpile TS to JS is the tsc command-line compiler that ships with the typescript npm package. You configure it via a tsconfig.json file that controls options like the target JavaScript version (ES5, ES2020, ESNext), the module system (CommonJS for Node.js, ESM for modern bundlers), and whether source maps are emitted. Build tools like Vite, esbuild, Webpack, and Babel also transpile TypeScript as part of their pipelines, usually much faster than tsc alone because they skip full type-checking.
Online TypeScript to JavaScript converters, like this one at SEOWebChecker.com, are invaluable for quick experiments, code reviews, learning, and debugging. If you receive a TypeScript snippet in a forum answer and your project doesn't use TypeScript, you can paste it here and get working JavaScript in seconds — no project setup, no npm install, no configuration file. Students learning TypeScript can also paste examples from tutorials and immediately see what the underlying JavaScript looks like, building intuition about what types actually erase to. Our tool supports target version selection, module system output, minification, diff view, and real-time validation — all running entirely in your browser so your code never leaves your machine.
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