This is just a quick utility to convert from a text file with hex bytes in it back into a binary file.
See the byte2hex utility to create a hex text file.
See the HexTools utility in GnuWin32 for a more feature-rich version.
This is a command-line tool. If you don't know what this means, this probably isn't the right tool for you.
It just takes hex bytes on stdin and spits out the binary values on stdout.
For example:
hex2bytemybinary.dat
There are no options.