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WebAssembly (WASM) Obfuscator – Online

Two tools in one. Paste WebAssembly Text format (.wat) to rename functions, locals, and encode strings. Or upload a .wasm binary to strip its name and debug sections. Everything runs in your browser — no uploads.

WASM Obfuscation Studio Browser-Only
Two modes, two guarantees

WAT mode (text): full source-level obfuscation — identifiers renamed, strings XOR-encoded with a matching runtime decoder, numbers transformed. Best for protecting WAT files you distribute or for pre-compilation obfuscation. WASM mode (binary): strips name, debug, and custom sections from compiled .wasm binaries. Cannot transform code logic — that requires native tools like wasm-mutate.

Ready
WAT Source 0 lines • 0 chars
Obfuscated WAT 0 lines • 0 chars
Obfuscation Options
After obfuscating, convert the output to .wasm with wat2wasm (from WABT) or an online WAT-to-WASM converter. The tool preserves export names so your module's public API stays stable.

Drop your .wasm file here

or click to browse · strips name, debug, and custom sections

Sections to Remove
Your .wasm file never leaves this browser tab. All parsing happens in JavaScript.
Complete Guide to WebAssembly Obfuscation

WebAssembly ships in two forms: .wat (WebAssembly Text format — human-readable assembly) and .wasm (binary format — what browsers execute). This tool handles both: full source-level obfuscation for WAT, and metadata stripping for compiled WASM binaries.

WAT vs WASM — What's the Difference?

FormatReadable?What This Tool Does
.wat (text)Yes — assembly-like syntaxFull obfuscation: rename identifiers, encode strings, obfuscate numbers
.wasm (binary)No — compiled bytecodeStrip: remove name, debug, and custom sections

WAT Obfuscation — What Actually Happens

WAT is a text format, so we can apply the same techniques used in JavaScript or Lua obfuscation:

  • Identifier renaming: $calculate_score → $a. Function names, parameter names, local names, and label names are all renamed. References throughout the module are updated.
  • String encoding: Data section strings are XOR-encoded and a decoder function is injected into the module. At runtime, the decoder reconstructs the original strings.
  • Numeric obfuscation (optional): Constants like 10 are replaced with equivalent expressions like (7 3 i32.add).
  • Comment removal: ;; line comments and (; ;) block comments are stripped.
Export names are preserved. If a function is exported as (export "greet"), the export string stays intact. External callers expect that name. Only internal identifiers are renamed.

WASM Strip — What It Removes

The binary format supports optional custom sections that can be removed without affecting execution:

SectionContains
nameFunction names, local names, module name
.debug_*DWARF debug info (line tables, type info)
sourceMappingURLURL to original source map
producersCompiler name and version
Binary strip is not code obfuscation. The instruction stream is unchanged. For real code transformation on compiled WASM, use native tools like wasm-mutate locally.

Recommended Workflow

  1. If you write WAT directly: Obfuscate it here, then convert with wat2wasm to produce a stripped compiled binary with obfuscated identifiers.
  2. If you have a compiled .wasm: Run it through the strip tool to remove metadata. For deeper protection, keep the source WAT, obfuscate it here, and recompile with wat2wasm.
  3. Test the result: Load the obfuscated module in a browser with WebAssembly.instantiate() and verify exports work as expected.

Frequently Asked Questions

Does WAT obfuscation affect execution?
No. Identifier renaming updates every reference in the module, string encoding uses a matching decoder, and numeric transformation produces equivalent values. The module behaves identically after obfuscation.
Is my file uploaded to your server?
No. All processing happens in your browser. WAT files are text pasted into a textarea. WASM files are read via the FileReader API and processed in JavaScript. Nothing is transmitted.
How do I convert obfuscated WAT back to .wasm?
Use wat2wasm from the WABT toolkit: wat2wasm obfuscated.wat -o output.wasm. There are also online WAT-to-WASM converters.
Can I obfuscate a .wasm binary directly with this tool?
You can strip its metadata (name, debug, custom sections). You cannot rename identifiers or transform code logic — the binary format is compiled bytecode. For that, obfuscate the WAT source and recompile.
Will the obfuscated WAT still work with wasm2wat (decompilation)?
Yes — it will decompile, but names will be missing or meaningless. This is the point: the decompiled output is harder to understand.
Are export names renamed?
No. Export names are the public API — external code calls them by that string. Renaming would break every caller. Only internal identifiers are renamed.
Does string encoding work in WASM's data section?
In WAT mode, yes — we encode the strings in the data section and inject a decoder function. In WASM strip mode, strings in the data section are not touched (they're part of the code, not metadata).
Can I use this for commercial projects?
Yes. Obfuscate any WAT or WASM you own or have rights to modify.
What about real code obfuscation for compiled .wasm?
Use wasm-mutate (Rust CLI) or wasm-opt with obfuscation passes locally. These tools require a terminal — they cannot run in a browser.
Does this tool validate that the obfuscated WAT is still valid?
The tool performs structural checks (balanced parentheses, preserved export names, round-trip verification for encoded strings). Full validation requires wat2wasm locally.

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