Amazon Seller Label Printing Guide (2026) — FBA & FBM Labels

Selling on Amazon means printing labels — lots of them. Whether you're using Fulfillment by Amazon (FBA) or Fulfillment by Merchant (FBM), you need product labels, shipping labels, box labels, and potentially suffocation warning labels, "Sold as Set" labels, and more. Amazon has strict requirements for each label type, and getting them wrong can result in receiving delays, additional fees, or even inventory being rejected at the fulfillment center.

This guide covers every type of label Amazon sellers need in 2026, the exact specifications Amazon requires, and how to print them efficiently using a thermal printer and LabelInn. Whether you're shipping 10 units or 10,000, this guide will help you set up a label printing workflow that's fast, accurate, and compliant with Amazon's requirements.

Types of Labels Amazon Sellers Need

Before we get into the printing workflow, let's catalog every label type you might need as an Amazon seller. The labels you need depend on whether you use FBA, FBM, or both.

1. FNSKU Labels (FBA Product Labels)

The FNSKU (Fulfillment Network Stock Keeping Unit) is Amazon's unique product identifier for your specific inventory. Every unit you send to an Amazon FBA warehouse must have an FNSKU barcode label on it — unless the product has a manufacturer barcode (UPC/EAN) and you've opted into Amazon's commingled inventory program (which most experienced sellers avoid due to counterfeit risk).

Specifications:

• Barcode format: Code 128 (Amazon standard)
• Label size: 1" × 2" (25.4mm × 50.8mm) or 1" × 3" (25.4mm × 76.2mm) — Amazon accepts both
• Must include: FNSKU barcode, product title (or abbreviated title), and condition (New, Used, etc.)
• Must cover any existing manufacturer barcode on the product to prevent scanning errors at the warehouse
• Text must be human-readable below the barcode

Common mistakes: Using the ASIN instead of FNSKU (they're different), printing barcodes too small to scan, not covering the manufacturer barcode, and using labels that don't stick well to the product surface.

2. Shipping Labels (FBA Inbound Shipments)

When you create an FBA inbound shipment in Seller Central, Amazon generates shipping labels (carrier labels) for each box you're sending to the fulfillment center. These are standard carrier shipping labels — typically UPS, FedEx, or Amazon's partnered carrier.

Specifications:

• Label size: 4" × 6" (100mm × 150mm) — the standard thermal shipping label size
• Generated by Amazon Seller Central or the carrier's system
• Must be placed on the outside of each shipping box

3. FBA Box Labels (Carton Labels)

Each box in your FBA inbound shipment needs an FBA box label (also called a carton label or FBA shipment label). This label identifies the box within your shipment and tells Amazon's warehouse system what's inside.

Specifications:

• Generated by Amazon Seller Central when you create your inbound shipment
• Contains a unique barcode identifying the box within the shipment
• Label size: 3⅓" × 4" (approximately 85mm × 100mm) — Amazon provides these as PDF
• Must be placed on a flat surface of the box, not on a seam or edge

4. FBM Shipping Labels (Merchant-Fulfilled Orders)

If you fulfill orders yourself (FBM), you need a shipping label for every order. You can purchase shipping through Amazon's Buy Shipping service (which offers discounted rates) or use your own carrier account.

Specifications:

• Label size: 4" × 6" (100mm × 150mm) for thermal printers
• Includes recipient address, sender address, carrier barcode, and tracking number
• Amazon Buy Shipping generates the label in Seller Central; third-party carriers generate through their own systems

5. Suffocation Warning Labels

Amazon requires suffocation warning labels on any polybag with an opening of 5" or more. The warning text must meet specific size requirements based on the bag size.

6. "Sold as Set" / "Ready to Ship" Labels

If your product is a multi-pack or bundle, Amazon requires a "Sold as Set" label so warehouse workers don't separate the units. If your product is already in shipping-ready packaging, a "Ready to Ship" or "Ships in Own Container" label tells Amazon not to re-box it.

Printing FNSKU Labels: The Complete Process

FNSKU labels are the most important — and most frequently printed — labels for FBA sellers. Getting them right is critical. Here's the complete workflow:

Step 1: Get Your FNSKU Codes

Log into Amazon Seller Central → Inventory → Manage All Inventory. Find the product you want to label. The FNSKU is displayed in the product details (it starts with "X0" followed by alphanumeric characters, e.g., X001ABC123). You can also download FNSKU labels directly from Seller Central by selecting products and clicking "Print Item Labels" — but the output is a PDF formatted for Avery sheet labels, not thermal printers.

Step 2: Set Up Your Label Template in LabelInn

Open LabelInn and create a new label template with the following settings:

• Label size: 1" × 2" (25.4mm × 50.8mm) — this is the most common FNSKU label size
• Add a Code 128 barcode element. Set the data source to the FNSKU value. Adjust the barcode height to at least 0.5" (12.7mm) for reliable scanning.
• Add a text element below the barcode. This should display the FNSKU number in human-readable format.
• Add the product title. Amazon requires the product title (or a recognizable abbreviation) on FNSKU labels. Add a text element above or below the barcode with the product name, truncated to fit the label width.
• Add the condition. Add "New" (or the appropriate condition) as a text element.

Step 3: Import Your Product Data

If you have many products, import them from a CSV/Excel file or directly from your Amazon Seller account via LabelInn's integration (Starter/Pro plan). Your spreadsheet should include columns for FNSKU, product title, and condition. LabelInn maps each column to the corresponding label element, so every product gets a unique, accurate FNSKU label.

Step 4: Print

Select the products that need labels, set the quantity per product (e.g., 100 FNSKU labels for 100 units of the same product), and print. LabelInn sends the labels directly to your thermal printer. A batch of 1,000 FNSKU labels prints in under 5 minutes on a standard thermal printer.

Pro tip: Print a few test labels first and scan them with the Amazon Seller app (or any barcode scanner app) to verify they scan correctly before printing your entire batch. A barcode that's too small, too compressed, or has poor print quality will cause receiving delays at Amazon's warehouse.

Printing FBM Shipping Labels from Amazon Orders

If you fulfill orders yourself (FBM), you need an efficient way to pull orders from Amazon and print shipping labels. Here's how LabelInn streamlines this process:

Option 1: LabelInn Amazon Integration (Starter/Pro Plan)

LabelInn's Amazon integration connects to your Seller Central account via the Amazon SP-API (Selling Partner API). Once connected:

1. Orders sync automatically. New FBM orders appear in LabelInn's Orders tab as they come in. You can filter by status (Unshipped, Pending, Shipped).
2. Select orders to ship. Check the orders you want to fulfill. LabelInn pulls the customer's shipping address, order ID, product details, and shipping service directly from Amazon.
3. Generate shipping labels. LabelInn creates shipping labels using your pre-configured label template. The label includes the customer's name and address, a carrier barcode, and the order reference number.
4. Print. Send all labels to your thermal printer in one batch. 100 orders = 100 shipping labels printed in under 2 minutes.
5. Confirm shipment. After printing, LabelInn can update the order status in Amazon Seller Central, marking orders as shipped and adding tracking information.

This workflow eliminates the need to manually copy addresses from Seller Central, switch between browser tabs, or deal with Amazon's clunky built-in label printing interface. It's especially valuable for high-volume FBM sellers processing 50+ orders per day.

Option 2: Export Orders to CSV/Excel

If you're on LabelInn's free plan (which doesn't include direct marketplace integrations), you can export your Amazon orders from Seller Central as a CSV file and import them into LabelInn. Go to Seller Central → Orders → Order Reports → New Order Reports → download the report. Import the CSV into LabelInn, map the columns (buyer name, address line 1, address line 2, city, state, zip, country), and print your shipping labels.

Thermal Printer Recommendations for Amazon Sellers

The right thermal printer can make or break your labeling workflow. Here are our top recommendations for Amazon sellers at different scales:

For New/Small Sellers (Under 100 Orders/Month)

Our pick: The Zebra ZD220 is the best starting point for Amazon sellers. It handles both small FNSKU labels (1×2") and full-size shipping labels (4×6"), is rock-solid reliable, and works perfectly with LabelInn — no driver installation needed.

For Medium Sellers (100–1,000 Orders/Month)

Our pick: The Zebra ZD421 offers the best balance of price, speed, and reliability for growing Amazon businesses. With optional Bluetooth and Wi-Fi, you can print from anywhere in your workspace, including from your phone.

For High-Volume Sellers (1,000+ Orders/Month)

Our pick: The Zebra ZT411 is the industry workhorse for high-volume Amazon sellers and 3PL operations. It's designed for continuous duty, has a large label roll capacity, and prints at 14 inches per second — fast enough for any operation.

All of these printers work with LabelInn out of the box — no drivers needed. LabelInn sends optimized ZPL (Zebra) or TSPL (TSC) commands directly to the printer for maximum print quality and speed. See our Zebra printer software guide for detailed setup instructions.

Amazon FBA Labeling Requirements: Compliance Checklist

Amazon's FBA program has specific labeling requirements. Failure to comply can result in unplanned service fees ($0.55 per unit for relabeling), receiving delays, or shipment rejection. Here's your compliance checklist:

Product Labeling (FNSKU)

• ✅ Every unit has an FNSKU barcode label (unless using commingled inventory with manufacturer barcode)
• ✅ FNSKU barcode is Code 128 format and scans correctly
• ✅ Barcode is at least 1" × 2" (25.4mm × 50.8mm)
• ✅ Human-readable FNSKU number is printed below the barcode
• ✅ Product title (or abbreviation) is on the label
• ✅ Condition (New, Used, etc.) is on the label
• ✅ Existing manufacturer barcode is covered by the FNSKU label
• ✅ Label is not wrinkled, smudged, or placed over a curved surface that distorts the barcode

Box Labeling (Carton Labels)

• ✅ Each box has the Amazon-generated FBA box label
• ✅ Box label is placed on a flat surface, not on a seam
• ✅ No old shipping labels or barcodes visible on the box that could confuse scanning
• ✅ Box weight does not exceed 50 lbs (individual items can exceed this if the single unit weighs more)

Poly Bag Requirements

• ✅ Products in poly bags with openings > 5" have suffocation warning labels
• ✅ Warning text meets minimum size requirements (24pt font for bags up to 60")
• ✅ Poly bags are transparent, have a barcode scannable through the bag, and are sealed

Multi-Pack / Bundle Labeling

• ✅ Multi-packs have a "Sold as Set" or "Do Not Separate" label visible on the outside
• ✅ Each multi-pack has a single FNSKU label for the bundle ASIN (not individual FNSKUs for each item)

LabelInn includes pre-built templates for all of these label types. Select the template, enter your data (or import from CSV/Amazon API), and print — confident that your labels meet Amazon's specifications.

Using LabelInn to Automate Amazon Label Printing

Here's how to set up LabelInn as your complete Amazon labeling solution:

Initial Setup (One-Time)

1. Download LabelInn from labelinn.com/download — available for Windows, macOS, Android, and iOS.
2. Connect your thermal printer. Plug in via USB or connect to Wi-Fi. LabelInn discovers it automatically — no driver needed.
3. Set up label templates. Create (or customize) templates for each label type you need:
   • FNSKU label: 1" × 2", Code 128 barcode, product title, condition
   • Shipping label: 4" × 6", recipient address, carrier barcode, tracking number
   • Box label: 3⅓" × 4" (or use Amazon's PDF)
   • Suffocation warning: Appropriate size for your poly bags
   • "Sold as Set" label: Standard size with clear text
4. Connect Amazon (Starter/Pro). Go to Integrations → Amazon, authenticate with your Seller Central credentials, and LabelInn syncs your products and orders.

Daily Workflow: FBA Product Labeling

1. Open LabelInn → Products tab (synced from Amazon)
2. Select the products you're sending to FBA
3. Set quantities (e.g., 200 units of Product A, 150 units of Product B)
4. Click Print → FNSKU labels print on your thermal printer
5. Apply labels to products, covering any manufacturer barcode

Daily Workflow: FBM Order Fulfillment

1. Open LabelInn → Orders tab (synced from Amazon)
2. Filter: Unshipped orders
3. Select all → Print Shipping Labels
4. Shipping labels print on your thermal printer
5. LabelInn marks orders as shipped in Amazon Seller Central

This entire workflow — from opening LabelInn to having printed labels in your hand — takes under 5 minutes for a batch of 50 orders. No logging into Seller Central, no downloading PDFs, no configuring browser print settings, no print dialog adjustments.

Frequently Asked Questions

What labels do I need for Amazon FBA?

At minimum, you need FNSKU barcode labels on every product unit and FBA box labels on every shipping carton. You may also need suffocation warning labels (for products in poly bags), "Sold as Set" labels (for bundles), and carrier shipping labels (for sending boxes to Amazon's warehouse).

Can I use my own barcode printer for FNSKU labels?

Yes. Amazon does not require you to use their PDF label sheets. You can print FNSKU labels on any barcode printer — thermal printers like Zebra, TSC, and Brother produce the best results. Just make sure the barcode is Code 128 format, at least 1" × 2", and scans correctly.

What's the best thermal printer for Amazon sellers?

For most Amazon sellers, the Zebra ZD220 (~$200) or Zebra ZD421 (~$350) is the best choice. Both handle FNSKU labels (small format) and shipping labels (4×6"), are extremely reliable, and work perfectly with LabelInn without driver installation. For high-volume sellers, the Zebra ZT411 industrial printer is recommended.

What size labels do I need for FNSKU?

Amazon's recommended FNSKU label size is 1" × 2⅝" (matching Avery 5160), but any label between 1" × 2" and 1" × 3" works. For thermal printers, 1" × 2" label rolls are the most readily available and cost-effective option.

Can I print Amazon shipping labels on a thermal printer?

Yes. Standard 4" × 6" (100mm × 150mm) thermal labels are the industry standard for shipping labels. LabelInn prints Amazon FBM shipping labels directly on thermal printers — no ink, no toner, no cutting sheets.

What's the difference between FNSKU and ASIN?

The ASIN (Amazon Standard Identification Number) identifies a product listing on Amazon. The FNSKU identifies your specific inventory of that product in Amazon's fulfillment network. Multiple sellers can sell the same ASIN, but each seller has a unique FNSKU. Always use the FNSKU — not the ASIN — on your FBA product labels.

Can I print Amazon labels from my phone?

Yes. LabelInn's mobile app (iOS and Android) supports designing and printing all Amazon label types from your phone. Connect your thermal printer via Bluetooth or Wi-Fi and print FNSKU labels, shipping labels, and more — directly from your phone. See our shipping label guide for details.

Conclusion: Streamline Your Amazon Labeling

Label printing is one of those Amazon seller tasks that's easy to underestimate and expensive to get wrong. Mislabeled products cause receiving delays, relabeling fees, and customer complaints. Manual labeling workflows (printing PDFs from Seller Central, cutting label sheets, hand-applying stickers) don't scale beyond a few dozen units.

The solution is straightforward: a thermal label printer and LabelInn. With LabelInn, you can print every type of Amazon label — FNSKU, shipping, box, suffocation warning, "Sold as Set" — from a single application, with direct Amazon integration, batch printing, and driverless thermal printer support. Whether you're a new seller shipping your first FBA box or a high-volume operation processing thousands of orders per month, LabelInn scales with you.

Stop wasting time on manual label workflows. Download LabelInn, connect your Amazon account, plug in your thermal printer, and start printing. Your first 100 FNSKU labels can be done in under 10 minutes.