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Barcode guides by platform

Each platform has its own quirks for adding UPCs, EANs, ISBNs, and FNSKU labels. Pick yours below.

Amazon
List products on Amazon US/Canada. UPC-A is the standard product identifier; FNSKU is required for FBA inventory.
Shopify
Sell on Shopify. UPC-A or EAN-13 in the product's Barcode field unlocks Google Shopping, Facebook commerce, and POS scanning.
Etsy
Sell on Etsy. UPC-A or EAN-13 in the product's GTIN field improves Etsy search ranking and Google Shopping eligibility.
eBay
Sell on eBay. UPC-A or EAN-13 in the product identifier field unlocks Best Match boost and Product Reviews.
Walmart
Sell on Walmart Marketplace or supply Walmart stores. UPC-A on units; ITF-14 on outer cases.
Amazon KDP
Self-publish on Amazon KDP. ISBN is the standard book identifier for cross-platform distribution.
Amazon EU
List on Amazon UK, DE, FR, IT, ES, NL, PL, SE. EAN-13 is the standard identifier; FNSKU still required on every FBA unit.
IngramSpark
Self-publish to bookstores and libraries worldwide. Requires your own ISBN — not KDP's free one.
UPS
Print UPS shipping labels with Code 128 / GS1-128 tracking codes for outbound parcels.
FedEx
Print FedEx shipping labels with Code 128 / GS1-128 tracking codes for outbound parcels.