GS1 US Data Hub Help Center
Did you license a GS1 US GTIN and want to create a barcode? Learn how to work with this GTIN in GS1 US Data Hub.
Did you license a GS1 US GTIN and want to create a barcode? Learn how to work with this GTIN in GS1 US Data Hub.
Q. What is the Check Digit?
A. This is the final digit that is calculated from the other digits of some GS1 Identification keys, including the GTIN-12 and GTIN-14. This digit is used to check that the data has been correctly composed.
Q. Does GS1 US Data Hub automatically generate the check digit?
A. Yes, if you click the "Let Us Assign Your GTIN" button, GS1 US Data Hub will incorporate your GS1 Company Prefix, reserve the right number of digits for the Item Reference, and generates the check digits.
Similarly, if you click the "Choose a Specific GTIN" button, enter the Item Reference, then click the "Get GTIN Check Digit" button. GS1 US Data Hub calculates the check digit for you.
If you already know the GS1 Company Prefix and Item Reference but would like to calculate this check digit manually, outside of GS1 US Data Hub, you can visit the GS1 US Check Digit Calculator page to calculate the check digit.
Q. What data should I enter in the Check Digit Calculator?
A. For a GTIN-12, which is the only GTIN that can be used in a UPC-A barcode, you should enter the following in the the GTIN-12 field:
If you are creating a "higher level" shipping/receiving item that contains multiple quantities of a single GTIN (such as an inner pack or case), you should enter the following in the GTIN-14 field:
Visit the GS1 US Check Digit Calculator page.