The last digit of all fixed-length, numeric GS1 Identification Keys is a check digit that ensures the integrity of the key.
All GS1 ID Keys need a check digit, except Component/Part Identifier (CPID), Global Individual Asset Identifier (GIAI) and Global Model Number (GMN).
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.
This document describes how GS1 barcodes and identification keys should be used.Access the GS1 General Specifications 19.0
GS1 ID Keys give companies efficient ways to access information about items in their supply chains, and share this information with trading partners.View the list of keys