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Luhn algorithm
This calculator calculates digit sequence checksum using Luhn algorithm (mod 10) and validation digit, the digit to be appended to the digit sequence to make whole sequence checksum equal to zero.
ICAO MRZ Check Digit
This calculator calculates the check digit from the other digits/alphabetic characters in the entered series. The calculation is done according to the algorithm used by ICAO for machine readable travel documents. The description of the algorithm can be found below the calculator.
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