hexyl is an open-source command-line hex viewer, crafted in Rust, that provides a beautifully formatted, colorized display of binary data. Its core feature is to present file contents in hexadecimal, decimal, and ASCII representations, making it easy to inspect raw data, identify patterns, and debug binary files. This utility is primarily aimed at developers, reverse engineers, security researchers, and anyone needing to peer into the low-level structure of files. A user would invoke hexyl when they suspect corruption in a file, need to understand a specific file format, or debug network protocols by examining packet captures. It functions as a standalone executable on Linux, macOS, and Windows.
Why It’s Useful
Unlike basic hex dumping tools, hexyl offers intelligent colorization based on byte entropy, highlighting patterns or anomalies in binary data that would otherwise be invisible. For the reverse engineer analyzing a compiled executable, hexyl's clear layout and entropy-based coloring can quickly point to code sections versus data, or encrypted regions. For the network engineer debugging a custom protocol, it allows for precise examination of packet headers and payloads. hexyl is entirely free and open-source. A less obvious feature is its ability to handle pipes (`cat binary_file | hexyl`), allowing it to be integrated into complex shell pipelines for on-the-fly inspection. Its niche functionality and the existence of many older, less user-friendly hex viewers mean it hasn't become a household name, despite its superior presentation and ease of use. The project is actively maintained on GitHub with a responsive developer.
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