Quick answer: An FBA labeling service prints Amazon’s FNSKU barcode and applies it to every unit before the unit ships to a fulfillment center. Because Amazon stopped labeling inventory itself on January 1, 2026, U.S. sellers now label every unit on their own or hire a prep provider. As a result, correct labeling protects you from rejected shipments, mixed-up inventory, and stranded units.
Labeling looks like the simplest step in the FBA process. However, one small mistake can hold up an entire shipment. This guide explains what changed, which barcode your units need, which mistakes cause problems, and how to choose between labeling in-house and outsourcing. Shiprep, a 3PL and prep provider in Bensalem, Pennsylvania, wrote it.
What Amazon’s 2026 Change Means for Sellers
Until 2026, Amazon applied FNSKU labels for you at inbound, for a fee. That option no longer exists for U.S. sellers. Now every unit must arrive at the fulfillment center with its label already on it.
Meanwhile, the risk of a mistake has gone up:
- Amazon can reject shipments with missing or incorrect labels.
- Lost or damaged units may not qualify for reimbursement.
- Products without a valid label can sit in a warehouse and never sell.
In short, nobody downstream fixes a labeling error anymore. You need to get it right before the box leaves your hands.
FNSKU, UPC, or Both? Which Barcode Your Units Need
Two barcode types cause most of the confusion:
| Barcode | Who creates it | What it does |
|---|---|---|
| FNSKU | Amazon, for your listing | Identifies the unit as your inventory inside Amazon’s system |
| UPC / EAN | The manufacturer | Identifies the product itself, the same for every seller |
The catch with relying on a manufacturer barcode is commingling. When several sellers list identical products, Amazon can pool the units together. As a result, you lose control over which seller’s unit reaches the customer. An FNSKU label, on the other hand, keeps your stock identifiable as yours.
Also, if a unit already carries a manufacturer barcode, the FNSKU label must cover it fully. That way, scanners read only one code.
Three Ways to Get Labels on Your Units
| Option | Works best when | Watch out for |
|---|---|---|
| Label it yourself | You ship small batches of simple products | Your time, printer quality, and errors as volume grows |
| Use a prep provider | You ship regularly or handle mixed products | Fees, minimums, and how the provider handles errors |
| Use a full 3PL | You also need storage and order fulfillment | Whether the 3PL covers every service you need |
There is no single right answer. For example, labeling by hand works fine at low volume. However, once you spend more hours on labels than on sourcing or marketing, outsourcing starts to make sense.
The Label Audit: 6 Mistakes That Cause Problems
| Mistake | What can happen | The fix |
|---|---|---|
| Old barcode left partly visible | The scanner reads the wrong code | Cover the existing barcode completely |
| Label placed on a seam, curve, or fold | The label won’t scan | Use a flat, smooth surface |
| Wrong FNSKU or SKU mismatch | Amazon tracks the wrong item | Check each label against the Seller Central listing before you print |
| Smudged or low-contrast print | The barcode becomes unreadable | Use quality labels and a clean thermal or laser print |
| Label placed before final packaging | A bag or wrap hides the label | Label after the last packaging step |
| Inconsistent bundle labeling | Receiving staff get confused | Label the finished sellable unit and follow Amazon’s set and bundle guidance. |
Run this audit on a few units before you ship a full batch. It takes only minutes, and it can save you a rejected shipment.
How an FBA Labeling Service Works at a Prep Provider
The workflow looks similar across good providers:
- Your inventory arrives at the warehouse from your supplier or from you.
- Receiving and count check. First, the provider confirms quantities and condition against what you sent.
- Label matching. Next, the provider matches each label to the right FNSKU.
- Application. Then the team applies each label and covers any old barcode.
- Final prep and dispatch. Finally, the team bags or bundles items where needed and prepares the shipment to Amazon.
Also, a reliable FBA labeling service flags damaged, missing, or mismatched units before they reach Amazon, when fixing them costs little.
Questions to Ask Before You Outsource Labeling
- How do you verify that each label matches the right FNSKU?
- How do you handle units that already have a manufacturer barcode?
- Can you combine labeling with bagging or bundling in the same pass?
- What is the turnaround from receiving to dispatch?
- How do you report damaged or mismatched units to me?
- Do you charge minimums, deposits, setup fees, or require long-term contracts?
The answer to the last question often decides the fit for smaller sellers.
Shiprep’s FBA Labeling Service in Bensalem, Pennsylvania
Shiprep handles labeling and tagging for Amazon FBA and Shopify. In addition, it offers packaging and bundling, order picking and packing, return processing, and FBA prep from its warehouse in Bensalem, Pennsylvania. You can see the full list on the services page.
Also, Shiprep asks for no advance payment, no setup fee, and no minimum order quantity from day one. As a result, you can send a small test batch before you commit to more. International sellers can also access purchasing credit and a Pennsylvania reseller tax exemption, and the guide to 3PL prep center services for international sellers explains the details. To estimate your costs, use the pricing calculator.
FBA Labeling Service FAQs
What is an FBA labeling service?
It is a service that prints Amazon FNSKU barcode labels and applies them to each unit before you send inventory to a fulfillment center. As a result, Amazon can identify and track your products.
Does Amazon still label FBA products in 2026?
No. Amazon ended its FBA label service for U.S. sellers on January 1, 2026. Now sellers label units themselves or use a prep provider.
Do I need an FNSKU label on every unit?
Every unit needs a scannable barcode. However, FNSKU labels are the safer choice because they keep your inventory identifiable as yours instead of pooling it with other sellers’ stock.
What happens if my labels are wrong or missing?
Amazon can reject the shipment. In addition, you may not receive reimbursement for lost or damaged units, and products without valid labels can sit in a warehouse and never sell.
Can a prep provider cover an existing barcode?
Yes, the FNSKU label has to cover the manufacturer barcode fully, so scanners read only one code.
Is it worth outsourcing labeling?
It depends on your volume and your time. At low volume, hand labeling can work. However, as your batches grow, the hours and the risk of errors usually make a provider worth it.
Does Shiprep require a minimum order or contract?
No, Shiprep works with no advance payment, no setup fee, and no minimum order quantity.
Let Shiprep Label Your Units
Send Shiprep a small batch or a full shipment, and see how it goes. Get a free quote for your FBA labeling service.
Before you ship, review Amazon’s official FBA prep requirements (Seller Central login required).