The EAN to ASIN and ASIN to EAN converter is a very handy tool that allows you to look up product information on Amazon. A GTIN is the ‘blanket’ description for both UPC and EAN. A UPC is a GTIN-12, an EAN is a GTIN-13 You can either enter in the ASIN number and get the GTIN (UPC or EAN) or you can enter in the GTIN and get the ASIN This utility will only allow you to do 10 searches per day unless you are are a UPCBarcodes member or you have subscribed to UPCBarcodes.com. When you purchase barcodes from the UPCBarcodes.com site, you are automatically enrolled. If you purchase barcodes from Nationwide Barcode, you will receive a link at time of purchase to join the site for free.