FNSKU or EAN – what is the difference?
When deciding between FNSKU and EAN codes, "the world is not black and white, even if the barcode itself might be." Both serve similar purposes but operate differently within various logistics systems.
EAN stands for "European Article Number" and represents a specific type of Global Trade Item Number (GTIN). GTIN functions as an umbrella term for globally unique product identifiers, encompassing EANs (GTIN-13) and UPCs (GTIN-12). An EAN is a 13-digit GS1-barcode typically obtained once per product.
FNSKU (Fulfillment Network Stock Keeping Unit) operates as Amazon's internal system label, combining the ASIN and seller identification.
Pros and cons of EAN
EAN codes are recognized throughout Europe and can be used in retail, supermarkets, and other sales channels for product identification within merchandise management systems. Each EAN is assigned once per product and can be used by any company selling that product.
Advantages:
- All sellers with the same EAN send products to a shared inventory pile at Amazon warehouses (commingled inventory)
- No need to reconsider barcode selection across different sales channels
- Works in stores, on platforms like eBay, and elsewhere with the same barcode
Disadvantages:
- Stock commingling creates hijacking vulnerabilities—fake products may mix with authentic ones, making accountability impossible
- Amazon increasingly enforces brand registry and GTIN validation, adding complexity
Pros and Cons of FNSKU
FNSKUs represent Amazon's proprietary labeling system. Because they connect to the seller or ASIN, you always know which article belongs to which seller.
Advantages:
- Non-commingled, seller-specific inventory ensures accurate tracking
- Prevents false accusations regarding fakes or plagiarism
- Essential for product categories requiring traceability (food, cosmetics)
- Amazon's Transparency Program offers serialized codes for enhanced brand protection
Disadvantages:
- Every seller account requires its own FNSKU code, reducing flexibility
- Codes only work within Amazon's ecosystem
- Sellers must print FNSKU labels themselves or pay for Amazon's Label Service
FNSKU or EAN: Which code do I need on my products?
Choose FNSKU if you want to prevent inventory commingling or if your products risk being counterfeited. Conversely, EAN codes work better when selling extensively outside Amazon or managing multiple accounts, though commingling risks exist on Amazon's platform.
SPACEGOATS offers solutions for existing FNSKU users: products can be uploaded with general EAN codes or relabeled with the account's FNSKU codes for proper assignment at Amazon shipping centers.