Hex Fiend

Hex Fiend is a fast, clever, and free Hex editor that has many unique features:

• 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.
• 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...
• Embeddable: It's really easy to incorporate Hex Fiend's hex or data views into your app. Its permissive BSD-style license won't burden you.

Now requires OS X 10.8 or later.

• Binary Templates are here! Note this is an early beta, and fields are currently read-only.
• New high-resolution app icon!
• Highlight selected bytes with a custom color via the "Highlight Selection" contextual menu
• Fix Find controls clipped on macOS 10.13
• Change banner views (Find, Jump to Offset, etc) to fixed heights to fix weird resizing
• Hexf can write to a non-existent file and diff two files via "hexf -d file1 file2"
• Hexf is now installed with escalated privileges
• Fixed hexf with relative paths
• Make file permissions on save more secure (thanks wesdawg)
• Added preference to disable alias resolving
• Added nullability annotations to the Framework for better Swift interoperability (thanks Ben10do)
• Hex Fiend is now fully converted to Automatic Reference Counting