Amazon Barcode vs Manufacturer's Barcode: Which One to Choose for FBA Products?
This blog discusses the differences between using the manufacturer's barcode or the Amazon barcode for labeling products for FBA (Fulfillment by Amazon) on the Amazon platform. The blog explains that each product must have a unique identifier known as the GTIN (Global Trade Item Number), such as UPCs (Universal Product Code) or EANs (European Article Number). The article outlines the pros and cons of using either barcode type, including factors like the type of product, uniqueness, convenience, the supply chain, and cost. Ultimately, the choice of which barcode to use depends on the specific needs and priorities of the seller.
As an Amazon seller, one of the crucial steps to getting your products listed and available for sale on the platform is product labeling. Every item you send to an Amazon fulfillment center must have a scannable barcode so warehouse workers and robots can pick, pack, and track your inventory accurately.
When it comes to FBA labeling, you have two main options: use the manufacturer’s barcode (UPC or EAN) or apply an Amazon barcode (FNSKU). Understanding the difference between these two options is essential for managing your inventory and avoiding costly mistakes.
What Is a GTIN?
A Global Trade Item Number (GTIN) is a unique identifier for products. GTINs include:
- UPC (Universal Product Code) — 12-digit code widely used in North America
- EAN (European Article Number) — 13-digit code used internationally
- ISBN — used for books and publications
These are the standard barcodes printed on product packaging by manufacturers. Amazon accepts GTINs as product identifiers when creating listings.
What Is an Amazon FNSKU Barcode?
The FNSKU (Fulfillment Network Stock Keeping Unit) is Amazon’s own unique barcode, generated per seller per product. It ties a specific item to a specific seller’s account, meaning Amazon can distinguish your inventory from other sellers who sell the same product.
When you print FBA labels from Seller Central, the label contains the FNSKU barcode.
Manufacturer Barcode vs Amazon Barcode: Key Differences
| Feature | Manufacturer Barcode (UPC/EAN) | Amazon FNSKU |
|---|---|---|
| Unique to seller | No (shared across sellers) | Yes |
| Mingling risk | High | None |
| Label printing required | No (already on product) | Yes |
| Cost | Free to use | Free (label printing cost only) |
| Best for | Private label, single-seller products | Multi-seller catalog items |
When to Use the Manufacturer Barcode
Amazon allows the use of manufacturer barcodes (through the Stickerless, Commingled Inventory option) when:
- You are the sole seller of that product
- The product is new and sealed
- You have brand registry and are confident no counterfeits or mixed inventory issues will arise
The advantage is you save time by not applying individual FNSKU stickers to every item.
Caution: Commingled inventory means Amazon may fulfill your customer’s order with another seller’s unit of the same product. If that unit is counterfeit or damaged, it can result in negative reviews or A-to-Z claims against your account.
When to Use the Amazon FNSKU Barcode
Using FNSKU is the safer choice when:
- Multiple sellers list the same product (commingling risk is high)
- You want to ensure customers receive only your units
- Your product is used, refurbished, or has unique bundling/customization
With FNSKU, you print and apply an Amazon label over the manufacturer barcode before sending items to the warehouse.
Printing FNSKU Labels with Label Resizer
Label Resizer makes it easy to print FNSKU labels in the right size for your thermal or desktop printer. You can:
- Resize labels to fit Dymo, Zebra, or Avery sheets
- Add free text (batch codes, expiry dates, custom notes)
- Print complete product titles for easier identification
- Download labels in bulk directly from Seller Central
Whether you’re printing on a 2×1” thermal label or standard letter-size Avery sheets, Label Resizer handles the formatting so your barcodes are always crisp and scannable.
Conclusion
The choice between manufacturer barcodes and Amazon FNSKU barcodes comes down to your product type, risk tolerance, and operational setup. For most sellers, FNSKU barcodes provide better inventory control and protect against commingling issues — making them the recommended choice for professional FBA sellers.
If you’re spending too much time formatting labels, give Label Resizer a try and streamline your FBA prep workflow.