Synalyze It! Pro

Synalyze It! Pro is a macOS‑only hex editor that can open binary files of any size and presents their contents alongside automatically decoded structures, strings, and numeric values. It includes a built‑in grammar editor that lets users define or modify binary templates in a graphical interface, with the grammars stored as plain XML for easy external editing. The application also ships with a collection of ready‑made grammars for common formats such as PNG, JPEG, WAV, and QuickTime, enabling immediate decoding of known files.

The tool is aimed at developers, data‑stream engineers, and computer‑forensics professionals who need to explore, reverse‑engineer, or edit binary data. By allowing simultaneous viewing of raw hex and interpreted data, it streamlines the process of discovering file‑format structures and testing assumptions across multiple files. Its ability to inherit and reuse grammar components reduces repetitive work when handling related formats.

Key features include automatic file decoding, side‑by‑side data views, binary comparison, and support for custom grammar creation and sharing, making it a practical environment for both ad‑hoc analysis and systematic reverse‑engineering projects.