univdreams

Upload an ELF, PE, Mach-O, or 6502 raw image — or paste a URL — and it decompiles to .ud source in the editor. Edit the source, click Compile, and the rebuilt binary downloads. The whole pipeline runs in this tab via WebAssembly; nothing leaves your browser.

Try it on the Windows msmpeg4 codec DLL (420 KB): load wmpcdcs8-mpg4c32.dll — structural decompilation of a real-world video codec, including i386 stdcall calls, switch tables, and Win32 imports.