Shoppers look up UPC bar codes by visiting online UPC databases and entering their bar code numbers. Websites that offer UPC databases include ScandIt.com, UPCDatabase.com, UPCDatabase.org and BarCodeLookup.com.
ScandIt.com offers a product database of over 25 million UPCs featuring product names and data associated with its UPC codes. On BarCodeLookup.com, users can type in their bar code numbers or the names of their products to view images and product information. UPCDatabase.org offers a database of different bar code types, including ones from the UPC, EAN and Bookland numbering systems. Searches provide images as well as information on product prices and manufacturers.