Overview

Amazon requires every unit shipped to its fulfillment network to display a machine‑readable barcode. The rule covers universal product codes (UPCs), European article numbers (EANs) and Amazon‑generated FNSKUs, and it was tightened in early 2024 with stricter brand‑registry validation and a new optional “A‑plus” barcode format. The change means that sellers must verify code ownership before listing and attach the correct label to each item. Failure to comply can trigger inbound rejections, delayed inventory availability, and additional removal or disposal fees.

Key Points

• UPC vs. EAN — A UPC is a 12‑digit numeric identifier used mainly in the United States, while an EAN contains 13 digits and serves as the global standard outside North America.
• FNSKU definition — The Fulfillment Network SKU is Amazon’s internal identifier that is unique to each seller’s listing, even when multiple sellers share the same manufacturer’s UPC.
• Barcode placement rule — Amazon mandates that the barcode be affixed to the outermost packaging, fully visible, and no smaller than 0.5 in × 0.5 in.
• GS1 registration requirement — Effective July 2023, Amazon accepts only UPC/EAN numbers that can be verified in the GS1 database; non‑GS1 codes are automatically rejected.
• Labeling options — Sellers may print their own FNSKU stickers, purchase Amazon‑issued labels for a per‑unit fee, or qualify for the “Sticker‑less” program where Amazon applies the barcode at the warehouse.
• Rejection statistics — In Q2 2024, about 18 % of inbound FBA shipments were delayed because of barcode errors such as missing FNSKUs or unreadable prints.
• A‑plus barcode option — Amazon introduced an optional “A‑plus” barcode format that can replace the FNSKU on eligible items, allowing brands to display richer product information while still meeting scanning requirements.

How Amazon Barcodes Work

1. Product creation — When a new item is entered in Seller Central, the seller supplies the manufacturer’s UPC or EAN (e.g., ). Amazon instantly cross‑checks this number against the GS1 registry; a mismatch forces the seller to provide a GS1‑issued code or request an exemption.