A fast and clever open source hex editor for macOS.

Download the latest version from the releases page.

• Insert, delete, rearrange. Hex Fiend does not limit you to in-place changes like some hex editors.
• Work with huge files. Hex Fiend can handle as big a file as you’re able to create. It’s been tested on files as large as 118 GB.
• Small footprint. Hex Fiend does not keep your files in memory. You won’t dread launching or working with Hex Fiend even on low-RAM machines.
• Fast. Open a huge file, scroll around, copy and paste, all instantly. Find what you’re looking for with fast searching.
• Binary diff. Hex Fiend can show the differences between files, taking into account insertions or deletions. Simply open two files in Hex Fiend and then use the File > Compare menus.
• Smart saving. Hex Fiend knows not to waste time overwriting the parts of your files that haven’t changed, and never needs temporary disk space.
• Data inspector. Interpret data as integer or floating point, signed or unsigned, big or little endian.
• Binary templates. Visualize the structure of a file through scripting. See documentation.
• Embeddable! It’s really easy to incorporate Hex Fiend’s hex or data views into your app using the Hex Fiend framework. Its permissive BSD-style license won’t burden you. See the API reference for details.