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Kotlin Academy · Lesson

Kotlin/WASM: Compiling to WebAssembly for the Browser

Target Kotlin/WASM, integrate with JavaScript, and run in a browser environment.

What Is Kotlin/WASM?

Kotlin/WASM is a Kotlin compilation target that produces WebAssembly (.wasm) modules for execution in browsers and server-side WASM runtimes. It is separate from Kotlin/JS and provides better performance and a smaller binary size for compute-intensive code.

Current Status (Kotlin 2.0)

As of Kotlin 2.0, Kotlin/WASM targets the WasmGC proposal — a W3C standard that brings garbage-collected objects natively to WebAssembly. WasmGC is supported in Chrome 119+, Firefox 120+, and Safari 18+. Kotlin/WASM is Stable as of Kotlin 2.1.

All lessons in this course

  1. Kotlin/Native Overview: Targets, Toolchain & Compilation
  2. Memory Management in Kotlin/Native: The New MM
  3. C Interop with cinterop and .def Files
  4. Kotlin/WASM: Compiling to WebAssembly for the Browser
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