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.

Barcode with check digit example
 

What is 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.

How does the check digit calculator work?

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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