WASM (.wasm, WebAssembly) is a binary instruction format for a portable, stack-based virtual machine. It enables code written in C, C++, Rust, Go and other languages to run at near-native speed in web browsers. WASM is used for games, video editing, scientific computing and more.

Are my WASM files uploaded?

No. Modules you open from your device stay on your device and are parsed locally. Only the public sample module is requested from the server.

Can I execute WASM modules?

The viewer focuses on inspecting the module structure (sections, imports, exports). Executing arbitrary WASM requires a specific host environment and is not part of the preview functionality.

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WASM Viewer

Free online WASM viewer. Open and inspect WebAssembly modules (.wasm) directly in your browser — no upload, no software.

.wasm

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WASM (.wasm, WebAssembly), standardized by the W3C in 2019, is a binary instruction format for a stack-based virtual machine designed as a portable compilation target. Code written in languages like C, C++, Rust, Go, C# and AssemblyScript can be compiled to .wasm and executed at near-native speed in web browsers and server-side runtimes. WASM modules contain typed sections (types, imports, functions, tables, memories, globals, exports, code) and support streaming compilation for fast startup.

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