Wasm 3.0 Released: GC, 64-bit Addresses, and More
2025-09-18
Three years in the making, the WebAssembly (Wasm) 3.0 standard is finally here! This substantial update boasts significant features, including 64-bit address spaces, expanding the addressable memory to 16 exabytes; support for multiple memory instances, enhancing large application and data handling; a garbage collection (GC) mechanism, greatly simplifying the process of compiling high-level languages to Wasm; typed references for improved type safety and efficiency; and tail calls, exception handling, and improved vector instructions. These enhancements make Wasm significantly better suited for compiling high-level languages like Java and OCaml, broadening its applications.
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