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Quick answer: download the FNSKU label file from Seller Central, choose a template that matches your label stock (for thermal printers, a single-label size such as 2.25 x 1.25 in is common), and print at 100% scale. Each label must show the FNSKU barcode, the product title and the condition.
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Why this matters more in 2026
Amazon stopped offering its FBA prep and item labeling service in the US from 1 January 2026, so sellers now apply every unit label themselves before inventory ships (OnlineLabels, Saltbox). A label that will not scan now means a delay or fee at receiving.
What an FNSKU label needs
- A scannable FNSKU barcode (starts with X00 for most items)
- The product title
- The condition, such as New
- Black print on a white background, with clear white space either side of the barcode
Common accepted sizes range from about 1 x 2 in up to 2 x 3 in (EcomBrainly). Always confirm the current templates in Seller Central.
Printing step by step
- In Seller Central, go to your shipment or Manage Inventory and choose Print item labels.
- Pick the label size that matches your roll. For a thermal printer, use a single-label (roll) template, not a sheet template like 30-up.
- Open the PDF and print to the thermal printer with paper size set to your label size.
- Set scaling to 100% / None. A barcode printed slightly shrunk can look fine and still fail at the scanner.
- Scan a test label with a phone barcode app or a handheld scanner before labelling the full batch.
Placement rules that cause rejections
- Cover the manufacturer barcode completely so only the FNSKU scans.
- Do not wrap a label around a corner or curve.
- If the unit is poly bagged, the barcode must scan through the bag or sit on the outside.
Which printer and labels
Most 4×6 desktop printers (Jadens, MUNBYN and similar) also print narrower labels, so one printer can handle shipping and FNSKU labels. Swap rolls and recalibrate when you switch.
Related: Amazon FBA prep in 2026.