Barcode Upc A Or Ean 13
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Barcode - UPC-A / EAN-13

The EAN/UPC symbology family of barcodes (UPC-A, UPC-E, EAN-13, and EAN-8 barcodes) are used for items that are scanned at the point-of-sale.   The UPC system is used in the US, EAN is for Europe.   
The first set of 6 numbers in these barcodes is called the prefix, and they refer to a specific a company.  That is why it is important for you to have the rights to the barcode. GS1 assigns a company their prefix.  To register a UPC, use GS1. Here's a link to their site for more information.... The next set of 5 numbers is called the Item Reference Number, for the specific item in the company's inventory.
The last digit of a barcode, is a number, ranging from 0-9, called a check digit. The check digit is calculated from all the other numbers in the barcode and helps to confirm the integrity of your barcode number. This number can be generated through Design & Print Online's calculations, and should match any GS1 provided number with check digit.

Prefix & Check digit


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