# WebAssembly binary format — file signature 00 61 73 6D at offset 0

For WebAssembly binary format, hex signature is 00 61 73 6D; offset is 0; extension is wasm, verified against its source on 2026-09-22.

- **Hex signature:** 00 61 73 6D _(verified: appears in the quote below)_
- **Offset:** 0 _(verified: appears in the quote below)_
- **Extension:** wasm _(verified: appears in the quote below)_
- **Format:** WebAssembly binary format _(verified: appears in the quote below)_

## What the source says

> 00 61 73 6D | ␀asm | 0 | wasm | WebAssembly binary format [67] |

## Source

- https://en.wikipedia.org/wiki/List_of_file_signatures

Last verified: 2026-09-22. Review by: 2027-09-22.
Part of [File format magic numbers](https://referencesource.org/file-format-signatures/).