If you’re sending products to an Amazon FBA warehouse you’ll need to make sure they are labelled correctly with either an Amazon FNSKU or a manufacturer’s barcode.

But what’s the difference? What is an Amazon FNSKU? And how do you create one? And where do you put it??

So many questions! But luckily, we’ve got all the answers for you right here.

Let’s dive in!

What is an Amazon FNSKU?

The Amazon FNSKU, or Amazon Fulfillment Network Stock Keeping Unit, is a unique identifier Amazon assigns to your product.

It allows Amazon’s fulfillment centers to easily manage and track FBA inventory for Amazon sellers.

When sellers list their items on Amazon, they provide information such as the item’s title, price, and product category.

Amazon then assigns the product with an FNSKU barcode so that it can better track and manage inventory.

Sellers can then download FNSKU labels that can be applied to individual units and act as the product’s barcode in replace of a manufacturer’s barcode.

Amazon FNSKU barcode vs manufacturer barcode

When creating a new listing on Amazon, you will be given the choice of using the manufacturer’s barcode or the Amazon barcode.

The Amazon barcode is the FNSKU, which we will show you how to create and download shortly.

The manufacturer’s barcode however is a barcode applied by the brand owner. If you are selling other brand’s products, this will already be taken care of and any product should already have this on

However, if you are a private label seller you will need to decide if you will use FNSKU labels or a manufacturer barcode.

We would generally recommend using an FNSKU label as it does have its distinct advantages – we’ll cover those shortly in the pros and cons

However, if you do decide to use a manufacturer barcode instead of an FNSKU label you will need to generate a barcode from a UPC or EAN number.

UPC vs FNSKU

A UPC is a 12-digit Universal Product Code, which is assigned to products at the manufacturer level.

This means that if you’re private labelling products you will need to assign a UPC number to each product you sell.

  • NOTE

Amazon requires sellers to use official GS1 UPC numbers rather than recycled numbers previously assigned to another business. However, Bar Codes Talk provide much cheaper GS1 barcodes with an Amazon Guarantee.

Once you assign a UPC number to a product, you can create a UPC barcode image using that number and either use a sticker to apply this barcode to your product or embed the barcode into your packaging design.

The UPC barcode will then be the barcode Amazon fulfillment centers scan when your products arrive, rather than the FNSKU label.

  • NOTE

You can only have one barcode per product – if you choose the manufacturer barcode option you don’t need an FNSKU label, and vice-versa.

EAN vs FNSKU

An EAN is a 13 digit European Article Number, which is used in Europe, the Middle East and Asia.

This is similar to a UPC but has an extra number at the beginning of it.

upc vs ean comparison image
Image credit: BarCodes Talk

An EAN functions exactly the same as a UPC code but is simply a version used by other countries.

ASIN vs FNSKU

An ASIN is an Amazon Standard Identification Number – a ten-digit code made up of numbers and letters which Amazon assigns to products sold on Amazon.

This is different from a UPC or EAN number as it is unique and only used for Amazon listings.

This means that if you have different variations of the same product (different sizes, colors etc) each variation will need a separate ASIN as no two listings can have the same ASIN.

Each FNSKU label will show the ASIN on it, but the two are separate product identifiers.

SKU vs FNSKU

As you can probably guess, SKU and FNSKU are very similar.

Whereas an FNSKU is a Fulilment Network Stock Keeping Unit, a SKU is simply a Stock Keeping Unit.

A SKU is a code that Amazon sellers assign to their own products, which helps them better track and manage inventory across multiple marketplaces.

  • NOTE

If you don’t assign products an SKU when creating a listing on Amazon, one will be automatically generated for you. So it’s best to plan your SKU structure ahead of time.

Do you have to create an Amazon FNSKU for your product?

No, in most cases you won’t be forced to use the FNSKU for your FBA inventory.

On rare occasions, you may be required to do so, such as when selling some consumable products.

But for the most part, you can decide which barcode to use.

How do you create an Amazon FNSKU?

Creating and applying Amazon FNSKUs is a relatively simple process.

Creating FNSKU labels

All you need to do is log in to Amazon Seller Central and click on Inventory > Manage Inventory.

Next to the product you want to generate the FNSKU label for, click the drop-down arrow next to the edit button.

Here you’ll see a ‘Print labels’ option.

print amazon fnsku

Click this and Amazon will give you the option to enter the number of labels needed.

Applying FNSKU labels

If you are going to print labels in order to apply to each unit with a sticker, enter the total number of units you’re sending into the Amazon fulfillment center.

Then you’ll need to download the PDF file, print item labels and manually apply to each individual unit – not just outer cartons like you would FBA shipment ID labels.

  • PRO TIP

Private label sellers are better off downloading a single FNSKU barcode and embedding that into a product’s box packaging design where the manufacturer’s barcode would typically go.

This has the benefits of saving a lot of time for you or your supplier in manually labelling each unit, and also looks a lot more professional.

Does the FNSKU go on master cartons?

No, you only need to print FNSKU labels on the individual units. You should instead apply a shipping label to your master cartons.

If you are shipping directly to Amazon FBA from your supplier, create a shipping plan on Amazon seller central and the shipment creation workflow will create an FBA shipment ID label for you to apply.

When should you use an Amazon FNSKU?

Our recommendation is that wholesale, arbitrage, and private label sellers using the FBA program all use an FNSKU to keep better track of inventory.

Any sellers using the FBM (fulfilled by merchant) method won’t be using the Amazon fulfillment process and therefore don’t need to use an FNSKU, instead sticking to the manufacturer barcode.

The pros of using an FNSKU barcode

The FNSKU code is a popular choice for many sellers for one main reason, but there’s another benefit to be had too.

Avoid commingled stock

The first and most significant benefit to using Amazon barcodes is that it ensures Amazon keep track of your specific items within its fulfillment process, meaning you avoid commingling (mixing up) stock with other sellers.

Commingling is when multiple sellers stock the same product with the same manufacturer barcode in an Amazon fulfillment center.

The commingled inventory is stored in the same pick and pack bins and units from either seller can be used to fulfil either seller’s orders.

This is generally not a problem for wholesale sellers or those operating an arbitrage business model.

But for private label brand owners, this can cause issues if a bad actor sends counterfeit products in using the same manufacturer’s barcode.

Using an FNSKU avoids this issue and is the number one reason why it is our recommended course of action.

Save money on barcode images

A supplemental benefit is that FNSKUs are free. Whilst you will still need to pay for and assign a UPC or EAN number to your product, you won’t need to produce a scannable barcode image.

GS1 charge extra for producing barcode images and using an FNSKU will also save on these costs.

The cons of using an FNSKU barcode

There is only really one minor downside of using an Amazon label on your products.

An FNSKU can’t be used for retail

If you’re looking to grow a private label brand and perhaps one day take your products into brick-and-mortar retail stores then you won’t be able to use an FNSKU as your ID label.

In this scenario, you’d need to use a manufacturer’s barcode.

A solution here though would be to add specific product labels with an FNSKU on when shipping products into FBA.

In Summary

As you can see, the pros of using FNSKUs far outweigh the cons, and Amazon makes it relatively easy to print item labels with its in-built system.

By using Amazon FNSKU’s, Amazon sellers can benefit from better inventory control across multiple marketplaces and avoid a host of potential issues arising from commingled inventory.

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