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posted Dec 10, 2010, 12:56 AM by d graham   [ updated Nov 18, 2012, 7:38 AM ]
HXD is a pretty awesome free Hex editor

hxd screenshot

I think WinHex is a good tool for dealing with hex also:

If you understand 1's and 0's then Hex should be a breeze. Hexadecimal numerals are used in computer science to represent binary values in a more understandable manner. Many character values and other important computer functions are easily represented and recognized with hexadecimal values. Hexadecimal values are based on the number 16. They can be counted as 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F.

For example:

1 in hex is 1 in dec

9 in hex is 9 in dec

A in hex is 10 in dec

FFFF in hex is equal to 65535 in dec

To calculate more values open the windows calculator and choose advanced or programmer on newer versions of windows.

Or go to: online to calulate on your own.