OpenAnyFile
What is a .wasm file?
WebAssembly Module is an executable format developed by W3C, first released in 2017. It is usually created by Emscripten, Rust, Go, AssemblyScript.
A compiled module. The browser's own compiler validates it here and lists every import and export — without running it.
File details
| Full name | WebAssembly Module |
|---|---|
| Category | Executables |
| MIME type | application/wasm |
| Signature (magic bytes) | 00 61 73 6D (\0asm) |
| Developer | W3C |
| Introduced | 2017 |
| Opens with | WebAssembly inspector |
| Uploaded? | No — read locally in your browser |
How to open a .wasm file
OpenAnyFile routes .wasm files to its WebAssembly inspector, which shows the module's imports and exports, validated but never run.
- Drop your .wasm file on the box above, click it to choose the file, or paste it with Ctrl+V.
- The real format is detected from the file's first bytes — not just its name.
- The file opens in the WebAssembly inspector.
- Use fullscreen for a closer look, check its checksums, or download it back unchanged.
What works — and what does not
Works
Viewing and inspecting: the module's imports and exports, validated but never run. Size, type, signature and checksums are always shown.
Does not work
Editing and saving back. OpenAnyFile is a viewer, not an editor — for changes you still need the original app.
Is it safe to open a .wasm file online?
Here, yes — because nothing is uploaded. Most "online viewers" send your file to their server. OpenAnyFile reads it with your browser's File API and decodes it on your own device, so there is no copy anywhere else. You can check: open your browser's network tab while opening a file — no upload appears.
Questions about .wasm files
Can I open a .wasm file without installing software?
Yes. OpenAnyFile opens .wasm files in your browser using its WebAssembly inspector. You get the module's imports and exports, validated but never run, with nothing installed and no account.
How do I know a file is really a .wasm file?
Check its first bytes instead of its name. A genuine WASM file begins with 00 61 73 6D (\0asm). OpenAnyFile shows the detected type, so a renamed file is easy to spot.
Is my .wasm file uploaded anywhere?
No. The file is read locally by your browser and never sent to a server — it even works offline once the page has loaded.
Does it work on phones?
Yes — on Android and iPhone, in any modern browser. You can also install OpenAnyFile as an app.
Related formats
Other formats from the same family:
Format facts checked and page updated on September 25, 2026.