What is a WebAssembly section?

WASM binary modules are partitioned into numbered sections (Type=1, Import=2, Function=3, Table=4, Memory=5, Global=6, Export=7, Code=10, Data=11) with explicit length prefixes.

How does memory allocation work in WebAssembly?

WASM memory is linear and structured in 64 KB pages. The Memory section declares initial page count and optional maximum page count.

WebAssembly (.wasm) Module Inspector

Analyze compiled WebAssembly binaries directly in the browser. Dissect binary sections, verify magic headers, inspect exported function signatures, and audit memory page limits offline.

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Total Sections 0

Exports 0

Memory Pages -

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Drag & drop any compiled .wasm binary module here

Binary is dissected completely client-side in browser memory

BINARY SECTIONS 0 sections

EXPORTS & IMPORTS 0 items

Type	Identifier	Signature / Details
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Frequently Asked Questions

What is the WASM magic header?

Valid WebAssembly modules must start with the 4-byte sequence 0x00 0x61 0x73 0x6D (\0asm) followed by the 4-byte version number (0x01 0x00 0x00 0x00 for Version 1).

How large is a WebAssembly memory page?

A WebAssembly memory page is precisely 64 KiB (65,536 bytes). A module requesting 16 initial pages reserves 1 MB of linear memory.