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Luhn algorithm - Calculate check digit

Calculate check digit using the Luhn algorithm. Fill in the box below to have it instantly computed.
The Luhn algorithm, a simple checksum verification algorithm, is also known as Luhn formula, modulus 10 algorithm, or mod 10 algorithm.
It is most notably used to validate credit card numbers and IMEI phone identification numbers.

Code (numbers only) without check digit
Check digit
Full code with trailing check digit