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use xxd -r . it reverts a hexdump to its binary representation. Edit: The -p parameter is also very useful. It accepts "plain" hexadecimal values, but ignores whitespace and line changes.
DESCRIPTION. xxd creates a hex dump of a given file or standard input. It can also convert a hex dump back to its original binary form. Like uuencode(1) and uudecode(1) it allows the transmission of binary data in a 'mail-safe' ASCII representation, but has the advantage of decoding to standard output.
You can use xxd to dump binary files just like hexdump and od, but you can also use it to do the reverse: turn a hex dump back into binary. If you run xxd with just a file name it dumps the data in a fairly standard hex dump format: # xxd bdata 0000000: 0001 0203 0405 ......
xxd is a linux command. Once the file is open, press ESC and then type :%! xxd -b and then press ENTER . Press ESC and then i for "INSERT" mode which allows you to edit.
As @user786653 suggested, use the xxd(1) program:
xxd -r -p input.txt output.bin
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