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.

• Hex Fiend is notarized for added security on 10.14+
• Binary template improvements:
• Add section selection
• Add entry command for arbitrary key/value fields
• Add eof as a special length parameter to go to the end of the file
• Add optional -hex argument for unsigned integers to display as hexadecimal
• Add str command that takes an encoding identifier
• Add sectionvalue command that sets the value of the current section
• Sections now auto-expand
• Add preference for controlling behavior on single and double click of template entries
• Set working directory to templates folder so "source" command can use relative paths
• Performing a copy with a selected entry copies its value to the clipboard
• Fix incorrect anchor usage in some commands
• Fix incorrect error handling with zlib_uncompress
• Fix window width adjustment when showing/hiding templates
• Prefix hexadecimal values with 0x to match Data Inspector
• Improve error messages for read failures
• Improve documentation
• Add anchored scrolling. When scrolling horizontally, the document will be anchored by the selection offset (if visible) or first visible byte
• Add column view (off by default)
• Add custom byte grouping
• Fix data inspector text alignment (thanks rpendleton)
• Fix plain/ascii text alignment with line numbers
• Fix crash when Color Bytes is enabled with a multi-byte text encoding
• Fix incorrect parsing of large ULEB128/SLEB128 values
• Move fonts in Font menu to bottom to improve handling for a large number of fonts