zsteg is a command-line steganography detection tool designed to identify and extract hidden data embedded within PNG and BMP image files. The tool specializes in detecting various steganography techniques including LSB (Least Significant Bit) steganography, zlib-compressed data, and data hidden by specific tools like OpenStego, Camouflage 1.2.1, and LSB with The Eratosthenes set. zsteg provides flexible analysis capabilities through customizable parameters for pixel iteration order, channel selection (R/G/B/A combinations), bit manipulation (LSB/MSB), and data extraction. Users can specify individual bits, apply prime number analysis, configure pixel alignment, and control bit inversion. The tool supports automated detection across all known methods or targeted extraction of specific payloads. Analysis features include configurable byte limits, ASCII string detection with adjustable minimum length thresholds, and integration with the 'file' command for automatic data type identification. The tool outputs color-coded results and supports verbose logging for detailed forensic analysis. zsteg is particularly useful for CTF competitions, digital forensics investigations, and security research involving image-based steganography.