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Universal Product Code. The Universal Product Code (UPC) is a barcode symbology that is widely used in the United States, Canada, United Kingdom, Australia, New Zealand, in European and other countries for tracking trade items in stores. UPC (technically refers to UPC-A) consists of 12 numeric digits, that are uniquely assigned to each trade item.
NOTE: In reality, an UPC-A symbol is an EAN-13 symbol with the first number system digit set to 0. For example, take the UPC-A code 075678164125. This same code, expressed as an EAN-13 symbol, would be 0075678164125.As you can see, we just slapped a leading 0 in front.Compare the original UPC-A symbol (top) to the EAN-13 symbol (bottom): At first glance, the two bar codes look different.NCODING EAN-13 (AND UPC-A) The encoding for EAN-13 (and UPC-A) bar codes is relatively straight-forward. To encode a value as an EAN-13 bar code, the checksum digit must first be calculated and the entire bar code, including check digit, may then be encoded as a sequence of bars and spaces.