Home · Learn · Amazon FBA Barcode Requirements: UPC, FNSKU, and Everything You Need (2026)
Amazon FBA Barcode Requirements: UPC, FNSKU, and Everything You Need (2026)
Amazon FBA has two barcode layers: the GS1 UPC on your retail packaging, and the X00-prefixed FNSKU label on every unit shipped to FBA. Here are the 2026 requirements.
Amazon FBA (Fulfillment by Amazon) has two distinct barcode requirements that trip up new sellers. First, every product listing needs a GS1-registered Product ID (UPC-A in North America, EAN-13 globally) — Amazon verifies this against the GS1 database before activating the listing. Second, every PHYSICAL unit shipped to an Amazon fulfillment center needs an FNSKU label (a Code 128 barcode starting with X00) so Amazon can route inventory to the correct seller account.
As of January 2026, Amazon no longer applies FNSKU labels for you — you must apply them yourself or pay a third-party prep service. Skipping either barcode is the #1 reason FBA shipments get held at receiving or destroyed.
The two barcode layers every FBA seller needs
Layer 1 — GS1 UPC/EAN: Register your products at gs1us.org (or your country's GS1 affiliate). Each SKU variant (color, size, flavor) needs its own GTIN. This is the barcode on your retail packaging that POS scanners read. Without a GS1-registered UPC, Amazon rejects your listing — resold UPCs from third-party brokers usually fail Amazon's verification. Layer 2 — FNSKU: Amazon generates this automatically when you create the listing. Print 1×2 inch removable labels and apply over your manufacturer UPC. Without an FNSKU, Amazon can't trace your unit to your seller account.
Amazon FNSKU label specifications (2026)
Size: 1×2 inches (25×51 mm). Color: black ink on white non-reflective label. Adhesive: removable (so customers don't see them). Material: standard label paper or direct-thermal — direct-thermal labels (Rollo, Zebra) are the prep-center standard. Placement: flat, fully covering any existing manufacturer barcode. Quality: must scan cleanly. Low-contrast prints or wrinkled labels get held at FC receiving — fix the label, ship again.
GTIN Exemption: when you don't need a UPC
If you sell handmade items, custom products, or you're in Amazon Brand Registry for a trademark you own, you can apply for a GTIN Exemption in Seller Central. Once approved, Amazon lets you create listings without a UPC — but you STILL need FNSKU labels on every FBA unit. GTIN Exemption is category-specific (handmade arts, custom-printed shirts, etc.) and Amazon may revoke it if your brand grows past the small-scale threshold. Most sellers find buying GS1 UPCs ($30+/year) is simpler than maintaining exemption status.
Stickerless commingled inventory: when Amazon skips FNSKU
Some Brand-Registry-enrolled sellers can opt into Stickerless Commingled Inventory, where Amazon uses your manufacturer UPC as the inventory identifier and skips FNSKU stickers entirely. Eligibility: Brand Registry approval, single-seller-per-ASIN setup, and certain categories only. The trade-off: customers may receive YOUR product when another seller's identical unit was scanned (commingling risk). Most sellers opt OUT of commingling and stick with FNSKU labels for inventory control.
Bulk FNSKU printing for prep centers
For Pro sellers shipping hundreds or thousands of units per SKU, manual label printing is slow. The fastest workflow: export your SKU + FNSKU CSV from Seller Central, paste into our Bulk Generator (Pro plan), choose Avery 5160 sheet PDF or 1×2 inch FBA sheet PDF, download. One PDF, hundreds of labels, laser-printer-ready. Prep centers like Box Up, AMZ Prep, and Outsource School use this exact workflow daily.
FAQ
What barcodes does Amazon FBA require?
Two layers: (1) A GS1-registered UPC-A or EAN-13 on your product packaging (verified against the GS1 database before Amazon activates the listing). (2) An Amazon-generated FNSKU label (X00-prefixed Code 128) on every individual unit shipped to FBA — for tracking inventory back to your seller account.
Do I need a UPC for Amazon FBA?
Yes, in most cases. Amazon requires a Product ID (UPC, EAN, or ISBN) to create a new listing. The only exception is GTIN Exemption — for handmade items, custom products, or trademark-protected brands enrolled in Brand Registry. Otherwise, register UPCs at gs1us.org (US) or your country's GS1 affiliate.
Does Amazon apply FNSKU labels for me?
Not anymore. As of January 2026, Amazon no longer applies FNSKU labels for sellers. You must apply them yourself before shipping to FBA, or pay a third-party prep center to do it. Amazon's FBA Label Service was discontinued in 2025-2026.
What size should an FNSKU label be?
1 × 2 inches (25 × 51 mm) is Amazon's official spec. Black ink on white non-reflective label stock, removable adhesive, applied flat over any existing manufacturer barcode. Smaller labels may not scan reliably; larger labels waste space on small products.
Why was my FBA shipment rejected?
Most common reasons: (1) Missing or unreadable FNSKU labels on units. (2) UPC on the manufacturer packaging doesn't match the GS1 database. (3) Wrong FNSKU on the unit (using a label from a different SKU). (4) Label placed crookedly or partially obscured. Fix the label issue and ship again — Amazon typically holds the shipment 30 days for correction.
Can I use the manufacturer's UPC instead of an FNSKU?
Only if you're enrolled in Amazon's Stickerless Commingled Inventory program — available to Brand-Registry-enrolled sellers in certain categories. For most FBA sellers, FNSKU labels are mandatory. Stickerless commingling has trade-offs (customers may receive another seller's identical product) and most sellers opt out.
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