What is the Best Size of Thermal Label for FBA Printing?

Choosing the right thermal label size is crucial for Amazon FBA sellers. This guide covers optimal dimensions for all FBA label types and printer-specific recommendations.

Why Thermal Printers?

Thermal printers are superior for FBA operations because they save you time and money compared to inkjet or laser alternatives. They use thermosensitive paper rather than ink, eliminating cartridge replacement costs.

Notably, Amazon uses them in their fulfillment centers with Zebra GX430t model printers—a strong endorsement of thermal printing technology.

Required FBA Labels

Amazon mandates two labels per box:

1. Shipping Label (4x6 inches)

• Enables carrier tracking via UPS/FedEx
• Standard size across the industry
• Printed directly from Amazon Seller Central

2. FBA Box Label (4x6 inches)

• Identifies seller inventory at warehouses
• Same dimensions as shipping labels
• Required for all inbound shipments

FNSKU Barcode Specifications

Amazon requires FNSKU barcodes meeting these criteria:

• Black ink on white, non-reflective removable labels
• Dimensions between 1" × 2" and 2" × 3"
• 300 DPI minimum resolution
• 0.25" side margins and 0.125" top/bottom clearance
• Must be scannable and durable

Recommended Label Sizes by Printer

For Zebra Printers

FNSKU Labels: - Size: 2" × 1.5" (50mm × 38mm) - Material: Waterproof with acrylic adhesive - Recommended for most product labeling

Shipping/Box Labels: - Size: 6" × 4" (152mm × 102mm) - Material: Permanent adhesive - Optimized for thermal printing

For DYMO Printers

FNSKU Labels: - Size: 57mm × 32mm - Material: Durable labels for long-term use - Perfect for LabelWriter series

Shipping/Box Labels: - Size: 104mm × 159mm (extra-large) - Compatible with 4XL models - High-quality thermal paper

Label Quality Requirements

All FBA labels must be:

• High contrast - Black on white for optimal scanning
• Non-reflective - Avoid glossy finishes that interfere with barcode readers
• Durable - Labels must survive warehouse handling
• Properly positioned - Flat surfaces only, with required clearances

AZLabels Solution

AZLabels offers a browser extension for Chrome and Firefox enabling one-click thermal label printing from:

• Amazon Seller Central
• UPS.com
• eBay

The system processes approximately 100 labels in 8 seconds, dramatically reducing fulfillment time.

Pricing

• Free tier: 100 product labels and 10 shipping labels monthly
• Premium tiers: Available for growing businesses needing higher volumes

Conclusion

For most FBA sellers:

• Use 2" × 1.5" labels for FNSKU barcodes
• Use 4" × 6" labels for shipping and box labels
• Invest in quality thermal labels to avoid scanning issues
• Choose waterproof materials for added durability

Proper label sizing ensures smooth warehouse intake and reduces costly processing delays.