What is SWFRecomp?
SWFRecomp is a static recompiler that translates Flash SWF files into portable C code, which can then be compiled to native executables or WebAssembly for modern web browsers.
Unlike emulators that interpret Flash bytecode at runtime, SWFRecomp performs a one-time translation, enabling Flash content to run natively without the Flash Player plugin.
Static Recompilation
Translates ActionScript bytecode to C code at build time, not runtime
WebAssembly Output
Compile to WASM for native browser execution with near-native performance
Native Builds
Also compiles to native executables
Try It In Your Browser
The entire recompilation pipeline runs in your browser — no server needed. Drop a .swf file and watch it get recompiled to C, compiled to WASM via Clang, and executed, all client-side.
Runtime SWF Injection
Experimental demos exploring how runtime APIs can be written in ActionScript and injected into recompiled SWFs at build time.
How It Works
1. SWF Parsing: Reads and decompresses the Flash SWF file
2. Code Generation: Translates ActionScript bytecode to portable C17 code
3. Compilation: Compiles C code to native executables or WebAssembly
4. Execution: Runs in browsers or as standalone applications