How to Reverse Engineer Unknown File Formats with ImHex
A new blog post from ImHex's creator walks through the process of reverse engineering an unfamiliar file format using the tool itself. ImHex is a free, open-source hex editor built specifically for this kind of work, offering features like a pattern language for annotating byte structures, built-in data inspectors, and visualization tools that go well beyond what a standard hex editor provides.
The post breaks down a real example: starting with a raw binary file, identifying magic numbers and headers, spotting repeating structures, and gradually building out a template that documents the format's layout. Rather than just theorizing, the author demonstrates ImHex's pattern-matching language in action, turning guesswork into a reusable specification others can apply to similar files.
It's a niche but useful skill for anyone dealing with proprietary formats, legacy software, or firmware blobs with no public documentation.