Hex Fiend
Hex Fiend is an open source macOS hex editor for viewing, editing, and comparing binary data, including very large files.
What is Hex Fiend?
Hex Fiend is a macOS hex editor used to inspect and edit binary file contents at the byte level. It is published on its official site by ridiculous_fish, with downloads and project information provided there, and the app is also maintained as an open source project. Its core purpose is to let users open files in hexadecimal and text views, make direct byte-level edits, search within binary data, and analyze file structure. The software is designed to work efficiently with very large files without loading the entire file into memory, which makes it useful for reverse engineering, debugging, digital forensics, data recovery, and low-level format inspection. Hex Fiend also includes tools such as binary diff viewing and a data inspector for interpreting values in multiple numeric formats and endianness. Mac users typically encounter it as a specialized utility installed intentionally for development or forensic workflows rather than as a background component.
Key features
- Open and edit binary files in hexadecimal and text views
- Handle very large files efficiently without loading them fully into memory
- Insert, delete, and rearrange bytes instead of only overwriting data
- Compare two files with a binary diff viewer
- Search quickly within binary data
- Inspect selected data as signed, unsigned, integer, or floating-point values
- Work with different byte orders and text encodings
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Safety overview
Status: Safe
Hex Fiend is a legitimate user-installed macOS utility for low-level file editing. It is safe when obtained from the official publisher site, but editing binary data can permanently corrupt files or devices if used carelessly.
Recommendation: Keep it if you use hex editing, binary inspection, reverse engineering, or forensic workflows. Remove it if you installed it for a one-time task and no longer need byte-level editing tools.
Common paths
/Applications/Hex Fiend.app
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