How to Generate Amazon FBA Barcodes (EAN-13, UPC) – Step by Step

If you're selling on Amazon FBA, you've probably faced this problem: 👉 Barcode requirements are confusing 👉 Label sizes are unclear 👉 UPC vs FNSKU? Not obvious I ran into the same issues, so I decided to break it down in a simple way. What is an Amazon FBA Barcode? Amazon uses barcodes to track your products in their fulfillment centers. There are two main types: UPC (Universal Product Code) → provided by manufacturer FNSKU (Fulfillment Network SKU) → generated by Amazon In most cases, Amazon prefers FNSKU because it uniquely identifies your product. Amazon FBA Barcode Requirements To avoid issues, your barcode must follow these: Size: typically between 1 x 2 inches and 2 x 3 inches Must be clearly printed (high contrast) Only one scannable barcode should be visible Must match the product listing exactly Common Mistakes Many sellers get this wrong: ❌ Using low-quality barcode images ❌ Printing incorrect label sizes ❌ Leaving multiple barcodes visible on packaging These can cause delays