FNSKU labeling is the most common FBA prep task and the easiest one to get wrong. We print labels from your shipment plan, cover every exposed barcode and scan-verify each unit before it is packed.
What FNSKU labeling involves
An FNSKU is the Amazon-assigned identifier that ties a physical unit to your specific listing and seller account. Each sellable unit needs one scannable FNSKU label on the outside of its packaging, and any other scannable barcode on the unit, such as a manufacturer UPC or EAN, must be covered so the receiving scanner can only read one code.
The label itself has to be durable, removable without leaving residue, and printed clearly enough to scan. Amazon's label templates include the barcode, the FNSKU, the product title and the condition. We print on thermal labels sized to the templates Amazon supports, apply them on a flat surface away from curves and seams, and avoid placing labels over seals or where a polybag edge will distort them.
Scan verification at the bench
Labeling errors usually come from mapping, not from the printer. A wrong FNSKU on a near-identical variation, a color or size swap, sends units to the wrong ASIN and creates customer complaints that are hard to trace.
Our workflow prints labels directly from your shipment plan data, groups work by SKU so variations are never labeled at the same station at the same time, and scan-checks a labeled unit against the expected SKU before the batch continues. Exceptions such as damaged units, count shortages or packaging that will not take a label are set aside and reported to you rather than improvised.
Labels for other marketplaces
Walmart Fulfillment Services receives items by their GTIN, so units need a scannable UPC or other GTIN that matches the item setup in Seller Center. Where the manufacturer barcode is missing or unreadable, we can apply a GTIN label you provide.
TikTok Shop's Fulfilled by TikTok program and seller-fulfilled channels such as Target Plus have their own labeling and packing expectations. We keep separate work instructions per channel, so a SKU that ships to two marketplaces gets the right label for each destination.
Over-labeling and relabeling
Relabeling is common when inventory moves between seller accounts, when listings are merged or split, when returned stock comes back with old labels, or when a supplier applied the wrong labels at the factory.
We remove or fully cover existing labels with opaque labels so only the correct barcode remains readable. When factory-applied FNSKU labels arrive, we sample-check them against your listings before forwarding cartons, because one wrong batch at the factory can mislabel an entire container. Relabeling is priced as its own line item so you can see exactly what correcting a supplier error costs.
What's included
- Labels printed from shipment plan data
- Unit-level scan verification
- Manufacturer barcodes fully covered
- Factory-label sample audits on inbound
- Relabeling and account-transfer labeling
- GTIN labels for Walmart WFS
- Condition labels for used or refurbished items
Frequently asked questions
Where should the FNSKU label go?
The FNSKU label goes on a flat outer surface of the unit's packaging where it can be scanned easily, not wrapped around a curve, edge or seam. Any other barcode on the unit must be covered so the receiving scanner reads only the FNSKU.
Can you label units that are already polybagged?
Yes, as long as the label can sit flat and scan cleanly. If the bag is loose or the existing barcode shows through, we rebag or apply the label to the unit inside a clear bag so the FNSKU is readable through it.
Do you supply the labels?
Yes. We supply thermal labels sized for marketplace templates and print them from your shipment plan. You do not need to send us printed labels.
What happens if the count does not match my shipment plan?
We stop and report the discrepancy with carton photos before labeling continues, so you can update the shipment plan instead of shipping a mismatch.