When in Hex Mode, the file may be viewed in one of several hex formats which are selected from the View menu (under Hex Formats) or from the right-click menu (Layout->Hex Formats).
The available formats are:
Byte
This is the default format. Each character in the file is displayed as an individual hex code (from 00 to FF).
Decimal
As above, but each byte is displayed in DECIMAL (from 0 to 255).
Octal
As above, but each byte is displayed in OCTAL (from 0 to 377).
Word
The data in the file is displayed as 16-bit words (always in hex)
DWord
The data is displayed as 32-bit double words (in hex)
Double DWord
The data is displayed as 64-bit quad-words (in hex)
Flip Ends
This only applies when in Word, DWord or Double DWord mode. The "ends" of each "word" are "flipped". This makes it easier to view data that is stored in little-endian format.
By default, each line displays 16 bytes of data, although the line length can be changed.
Note
The file offsets are always displayed in Hex.