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The last digit of a barcode number is a computer check digit which makes
sure the barcode is correctly composed. Use our check digit calculator
below to calculate a check digit.
The last digit of all fixed-length, numeric
GS1 Identification Keys is a check digit that ensures the integrity
of the key. Most GS1 ID Keys need a check digit.
The check digit is calculated using a simple
algorithm, based on the other numbers in the key. Find out how to
calculate a check digit manually.
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