The Complete Guide to GS1-128 Carton Labels

The GS1-128 label (also called the UCC-128 label) is the standardized shipping label required by virtually every major U.S. retailer. It contains human-readable text and barcodes that allow retailers to receive and process your shipment accurately and automatically.

What’s on a GS1-128 Label?

A compliant label is divided into four horizontal zones:

Zone A (Top)
The carrier routing information — retailer DC or store address, carrier SCAC, pro number.

Zone B (Upper Middle)
Retailer-specific data including store/department number, vendor number, and PO number.

Zone C (Lower Middle)
Item-level data: description, quantity, UPC.

Zone D (Bottom)
The Serial Shipping Container Code (SSCC-18) barcode — the unique identifier for each carton.

Common Mistakes That Cause Chargebacks

• Wrong font size on human-readable text
• SSCC-18 not unique per carton
• Missing Application Identifiers (AIs)
• Label stock not meeting size requirements (typically 4" x 6")
• Barcode quiet zones too narrow

Retailer-Specific Requirements

Every retailer has their own spin on GS1-128. Walmart’s requirements differ from Target’s, which differ from Home Depot’s. Spring Systems PortalApp generates retailer-specific compliant labels automatically based on current specifications — and updates whenever retailers change their requirements.

Testing Your Labels

Before going live with a retailer, submit sample labels for approval. Most retailers have a certification portal or vendor compliance team that reviews label formats. Spring Systems coordinates this process on your behalf.