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 or even inventory rejection.
How to Generate a Barcode (The Easy Way)
Instead of dealing with complicated tools, you can generate barcodes instantly in your browser.
I built a simple tool for this:
👉 https://barkodkarekod.com/en/ean13-barcode-generator.html
It supports:
- EAN-13
- Code128
- UPC
- QR codes
No signup, no backend — everything runs client-side.
Bonus: Choosing the Right Barcode
- Use UPC if you already have manufacturer codes
- Use FNSKU if you're doing private label (recommended for FBA)
Final Thoughts
Amazon FBA barcodes don’t have to be complicated.
Once you understand the basics, it becomes a simple process:
- Choose the right barcode type
- Generate it correctly
- Print with proper size
If you're working on FBA or building tools in this space, I’d love to hear your experience.
What’s the most confusing part about Amazon barcodes for you?
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