How to print FNSKU labels on a thermal printer
- In Seller Central, open your shipment and go to the step where you print item labels. Choose any sheet layout (30 per sheet on Letter, or 21, 24, 27, 40 or 44 per sheet on A4) and download the PDF. If Amazon offers your thermal label size directly, you can use that and skip this tool.
- Drop the PDF in above, pick the same sheet layout and your thermal label size, and press Split into single labels. Partly filled sheets are fine; empty spaces are skipped.
- Print at 100% scale with the paper size set to your label size in the printer driver.
- Scan a test label with a barcode scanner app on your phone and check the code matches the FNSKU in Seller Central before you label everything.
Why not just use label sheets?
Sheet labels work, but they're slow and fiddly for regular shipments: a misfed sheet shifts every barcode, partly used sheets are hard to reuse, and peeling 30 small stickers off a backing sheet takes a while. A thermal printer prints exactly the labels you need, one at a time, with no ink. Split once, print the whole batch, and stick each label straight from the printer onto the item.
Which thermal label size?
| Label size | Common printers | Notes |
|---|---|---|
| 2.25 × 1.25 in (57 × 32 mm) | Dymo LabelWriter, Zebra desktop printers, Rollo | The most popular size for FNSKU labels |
| 2 × 1 in (51 × 25 mm) | Zebra, Rollo, generic thermal printers | Smallest practical size; text gets small |
| 62 × 29 mm | Brother QL series (DK-11209) | Common in the UK and EU |
| 50 × 25 mm, 40 × 30 mm | Generic and budget thermal printers | Check your roll's exact size |
Whatever size you use, make sure it meets Amazon's current item label requirements in Seller Central help, and that the barcode scans reliably.
Tips for labels that scan every time
- Never use "Fit to page". It can shrink the barcode below the size scanners need.
- Calibrate the printer after loading a new roll so labels don't drift across the gaps.
- Turn up the darkness if the bars look grey or broken.
- Cover any existing barcodes on the product packaging so only the FNSKU can be scanned.
- Store labelled stock away from heat. Direct thermal labels darken with heat and fade in strong sunlight over time.
FAQ
Which sheet layout should I pick?
The same one you chose when downloading from Amazon. The tool lines up a grid for that layout and takes each label from its own space, so small differences in sheet margins between brands don't matter.
Some labels came out wrong or are missing.
Check the sheet layout matches the PDF. If it does and labels are still wrong, tell us which layout and marketplace you used.
Does it work for shipping (box) labels?
This tool is for small item labels. For 4×6 box and shipping labels, use the shipping label to 4×6 converter.
Is my data uploaded?
No. The PDF is split inside your browser and never leaves your device.