FNSKU Labeling Guide for Amazon FBA Sellers

An FNSKU (Fulfillment Network Stock Keeping Unit) is Amazon's scannable label that ties inventory to your seller account when using FBA. Manufacturer barcodes can be used in some cases, but most private label and wholesale sellers sticker each unit with an FNSKU before check-in.

Incorrect or missing FNSKU labels are among the most common causes of inbound problems. Labels must be readable, placed over existing barcodes, and printed from your Seller Central shipment workflow.

When sellers use a prep center for FNSKU labeling

High-volume replenishment: labeling hundreds or thousands of units in-house is slow and error-prone.

Supplier-direct inbound: inventory arrives from overseas or domestic factories without Amazon labels.

Mixed prep: units need labeling plus poly bagging, bundling, or inspection before forwarding.

Volume-based labeling pricing

Smart Prep Services offers tiered FNSKU labeling from $0.60 per unit for small batches down to $0.40 per unit at 500+ units, with free receiving and two weeks of storage included. Box labels are applied per your outbound carton plan.

Send your labeling instructions with each inbound shipment. We apply FNSKU and box labels per your Seller Central plan so cartons arrive ready for Amazon FC check-in. Get a labeling quote for your next shipment.