Walmart WFS Prep Requirements: The Full Barcode, Labeling & Packaging Checklist
Key takeaways
- WFS requires a scannable 12-digit UPC or 14-digit GTIN on every unit — FNSKUs are not accepted.
- The unit barcode goes on the unit; the shipment/receiving label goes on the case or pallet, never combined.
- Each variant needs its own unique barcode.
- Print quality at 300+ DPI matters — low-contrast prints are a common cause of receiving flags.
- Multi-channel sellers need a prep partner who splits and separately labels Amazon-bound and WFS-bound batches from the same shipment.
Sellers moving from Amazon FBA into Walmart WFS often assume prep is a copy-paste of what already works on Amazon. It is not. WFS has its own barcode rules, its own packaging expectations, and its own receiving label format, and getting any of them wrong results in the shipment being flagged at receiving rather than quietly accepted.
Unit barcode requirements
- Every sellable unit needs a scannable 12-digit UPC or 14-digit GTIN on its own packaging.
- FNSKUs, EANs, and vendor SKU numbers are not accepted as the primary scannable identifier.
- The barcode goes on the individual unit, never on the outer case.
- Variant items (different sizes, colors) each need their own unique barcode — one barcode cannot represent multiple variants.
- Print at 300 DPI or higher; lower-resolution prints commonly fail scan verification at receiving.
Case and pallet labeling
Master cases and pallets need their own receiving label carrying the shipment ID from Walmart Seller Center — this is separate from the unit barcode and is what the fulfillment center scans to receive the shipment as a whole. Both label types are generated from Seller Center and need to be applied to the correct level of packaging: unit barcode on the unit, shipment label on the case or pallet.
Where sellers most often get flagged
- Shipping units still wearing an Amazon FNSKU with no WFS-compliant barcode underneath or alongside it
- Applying the case-level shipment label to individual units instead of the case
- Reusing a single barcode across size or color variants
- Low-contrast or smudged thermal prints that fail a scan test at the fulfillment center
- Missing suffocation-warning labeling on poly-bagged items where required
Running WFS prep alongside Amazon FBA
If you sell the same SKU on both Amazon and Walmart, plan for two labeling passes from one supplier shipment, not one. Our Walmart WFS prep service receives the full shipment, splits it by destination at intake, and applies FNSKU labels to the Amazon-bound batch and UPC/GTIN labels to the WFS-bound batch before either leaves our Ozone Park, NY warehouse.
Frequently asked questions
Does Walmart WFS accept Amazon FNSKU labels?
No. WFS requires a scannable 12-digit UPC or 14-digit GTIN as the unit identifier and does not accept FNSKUs, EANs, or vendor SKU numbers in their place.
Can one barcode cover multiple product variants?
No. Each variant — different size, color, or bundle count — needs its own unique barcode. Reusing one barcode across variants is a common cause of receiving issues.
What DPI should WFS barcode labels be printed at?
At least 300 DPI. Lower-resolution prints, especially from inkjet or older thermal printers, frequently fail scan verification at the fulfillment center.
Ready to prep your next FBA shipment?
Request a quote from our Ozone Park, NY prep warehouse. We respond within one business day.