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Do I need an FNSKU, or can I use my UPC or EAN?
For inventory shipped on or after 31 March 2026, Amazon's guidance indicates that resellers (sellers without the Brand Representative role in Amazon Brand Registry) use Amazon barcodes (FNSKU labels), even when the product already has a manufacturer barcode. Brand owners with the Brand Representative role no longer need to apply Amazon barcode stickers to products that already have a manufacturer barcode, so a manufacturer barcode (such as a UPC or EAN) may be an option for them, depending on product eligibility. Products without a manufacturer barcode use an Amazon barcode, for brand owners and resellers alike. The checker above asks up to 5 questions for the UK, EU and US.
Which barcode goes on your units?
Amazon barcode (FNSKU)
An Amazon barcode label for your units.
- Amazon's guidance indicates resellers are required to use Amazon barcodes, and brand owners and resellers alike use them for products with no manufacturer barcode.
- The checker suggests it as the safer route when you're not sure.
Manufacturer barcode (UPC/EAN)
A barcode already printed on the product, such as a UPC or EAN.
- Amazon's guidance indicates sellers with the Brand Representative role no longer need Amazon barcode stickers for these products.
- Using one may also depend on product eligibility conditions, such as new condition, one barcode matching a single ASIN, and certain product categories, where Brand Registry exemptions may be possible.
- Check the barcode type for each SKU in Seller Central.
Amazon's 31 March 2026 change
Amazon announced that commingling practices end for inventory shipped on or after 31 March 2026, and that it would update eligibility criteria for using manufacturer barcodes. Before that, units from different sellers sharing a manufacturer barcode could be fulfilled from the same pool. Amazon's guidance indicates resellers are now required to use Amazon barcode stickers even for products that have a manufacturer barcode, while Brand Representatives no longer need to for products that already have one.
Next steps: convert Amazon's label PDF for a thermal printer, make labels in bulk from a CSV, or read how to print FNSKU labels.
Sources (12) · Last reviewed 6 October 2026
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