WebAssembly (WASM) Analyzer
Inspect WASM binary sections, imports, exports, and function signatures — no tooling required
Drop a .wasm file here
Parsed entirely in your browser — nothing uploaded
Curious what is inside a .wasm binary? Upload the file and instantly see its magic number validation, WebAssembly version, section table (type, import, function, export, code, data, and custom), and decoded imports and exports. Useful for quick audits, debugging, and learning how WebAssembly modules are structured — without needing wasm-objdump or any local tooling.
How to Analyze a WASM File
Upload your .wasm binary and get a full structural report instantly.
Upload your .wasm file
Drag and drop a .wasm binary onto the upload area, or click to browse. The file is read entirely in your browser — it is never sent to a server.
Read the section report
The analyzer decodes the binary format and shows the magic bytes ( 0asm), version number, and a table of every section with its index, name, and byte size.
Inspect imports and exports
Expand the imports and exports panels to see all declared module/function names, types, and whether each entry is a function, memory, table, or global.
Features
Validates magic number and WebAssembly version
Decodes the full section table with byte sizes
Lists all imports (module + name + type)
Lists all exports (name + kind)
All processing is local — your binary never leaves your browser
Drag-and-drop file upload
Free, no sign-up, no tooling required
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Frequently Asked Questions
What is a WebAssembly section?
A WebAssembly binary is divided into numbered sections. Each section has a specific role: Type (function signatures), Import (external dependencies), Function (maps indices to types), Export (public API), Code (function bodies), Data (initial memory contents), and Custom (arbitrary metadata like debug info or source maps).
Can I inspect a .wasm file without wasm-objdump?
Yes. This tool parses the binary format directly in your browser using the WebAssembly binary specification. For quick inspection of sections, imports, and exports it covers most common use cases without installing any native tools.
Is my .wasm file sent to a server?
No. The file is read with the browser FileReader API and parsed entirely with JavaScript. Nothing is uploaded or transmitted.