RetDec is a retargetable machine-code decompiler built on the LLVM framework that converts compiled binary code back into readable C-like source code. The tool supports multiple file formats including ELF, PE, Mach-O, COFF, AR (archives), Intel HEX, and raw machine code. It can process binaries compiled for various processor architectures such as Intel x86, ARM, MIPS, PIC32, PowerPC, x86-64, and ARM64. RetDec provides static analysis capabilities that examine binary files without executing them. The decompiler can detect compilers and packers used to create the original binary, decode individual machine instructions, and remove library code to focus on the core application logic. Additional features include extraction of debugging information when available, reconstruction of instruction idioms to improve code readability, and detection of C++ class hierarchies in object-oriented programs. The tool generates human-readable C code output that security researchers and reverse engineers can analyze to understand program functionality and identify potential security issues.