Tool 01 - Document
Passport check
The machine-readable zone carries its own check digits. If they do not add up, one character was mis-copied - and it is almost always a digit that looks like another digit.
Passport check
ICAO 9303 · TD3
Two lines of exactly 44 characters. Keep the < filler characters.
The MRZ cannot show whether a space belongs to the surname or the given name. This field settles it.
The last character is a check digit computed from the first 17.
Official sources