FNSKU labels are generated in Seller Central under Manage Inventory — select the ASIN, choose Print Item Labels, and select the label size (most prep centers use 1x2.625 inch thermal labels). Download the PDF and send to your prep center.
For large batches, use the bulk download function in Seller Central to generate label files for multiple ASINs simultaneously. Organize label files by shipment or SKU name so the prep center can match them to the correct inventory.
Some prep centers connect directly to your Seller Central account and pull FNSKU labels themselves. This eliminates the file transfer step but requires granting the prep center limited API access — confirm you are comfortable with the access level required.
Wholesale label printing at a prep center is cost-effective at volume. Most prep centers charge $0.05–$0.10 per label for thermal FNSKU printing, which becomes negligible per-unit at any significant scale.