WASM to WAT Converter | WebAssembly Viewer

Convert WASM to WAT online: disassemble a WebAssembly binary into readable text with imports, exports, function names and SIMD. Runs in your browser. Free.

Also known as: wasm to wat online · wasm to wat converter · webassembly disassembler · wasm decompiler online · wasm viewer online · wasm file viewer · wasm2wat online · convert wasm to text format · webassembly text format

javascript and typescript tools

developer utilities

converters

WASM Input

Drop a .wasm file here, or click to browse

The file is read in your browser and never uploaded or executed.

WAT Output

About WASM to WAT Converter

A WASM to WAT converter turns a compiled WebAssembly binary (.wasm) back into the WebAssembly text format, so you can read the imports, exports, function bodies and data segments a compiler produced. Use it to audit a third-party module before you ship it, debug a Rust, C++ or Go build, or see what the wasm embedded in an npm package actually does. Everything runs in your browser.

Key Features

Decodes the full instruction set: MVP, sign extension, saturating truncation, bulk memory, reference types, tail calls, exceptions, threads and atomics, SIMD and relaxed SIMD
Reads the name section, so functions, locals and globals keep their $names from Rust, Emscripten and wasm-bindgen builds
Accepts a .wasm file or pasted base64, base64url, a data: URI, hex or a JavaScript byte array copied from a bundle
Lists the producers section (compiler and toolchain versions), target features and every custom section with its size
Output reassembles with wat2wasm: tested against WABT on Emscripten and Rust binaries up to 3.4 MB
Marks a function it cannot decode with a comment instead of failing the whole module

Use Cases

Audit a third-party .wasm before it ships on your site: check its imports for network, filesystem or clock access
Debug a Rust or C++ build when a function is missing from the exports or has the wrong signature
Inspect WebAssembly inlined as base64 inside a JavaScript bundle on a production site
Compare what -O2 and -Oz builds of the same crate emit, function by function
Learn the WebAssembly text format by disassembling small modules you compiled yourself

Supported Formats

.wasm (WebAssembly 1.0 core module)

Base64 and base64url text

data:application/wasm;base64 URI

Hex dump (00 61 73 6d ...)

JavaScript Uint8Array literal

Related Keywords

wasm to wat

wasm to wat online

wasm to wat converter

webassembly disassembler

wasm decompiler online

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wasm file viewer

wasm2wat online

convert wasm to text format

What is the difference between WASM and WAT?

WASM is the binary format that browsers and runtimes such as Node.js, Wasmtime and Cloudflare Workers execute. WAT is its human-readable text form, defined by the same W3C specification: every type, instruction and section in a .wasm file has an exact WAT spelling, so converting between them loses nothing but comments. This converter reads the binary without running it, so even a module that would trap or needs imports you do not have can be inspected safely. WebAssembly components (the component model) and GC-proposal modules are detected and reported instead of being mis-decoded.

Privacy & Security

All processing happens locally in your browser. Your data never leaves your computer, ensuring complete privacy and security.

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Frequently asked questions

What is WASM to WAT Converter used for?

Convert WASM to WAT online: disassemble a WebAssembly binary into readable text with imports, exports, function names and SIMD. Runs in your browser. Free.

Is WASM to WAT Converter free to use?

Yes. WASM to WAT Converter is completely free with no usage limits, and there is no paid tier required to use it.

Do I need an account to use WASM to WAT Converter?

No. WASM to WAT Converter works immediately in your browser with no signup, login, or email address required.

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