About GS1-128 Barcodes
GS1-128 (formerly UCC/EAN-128) is a standardized 1D shipping and logistics barcode that uses the Code 128 symbology to encode GS1-compliant data. It is the global standard for tracking shipment inventory and providing information about trade items, pallets, and shipping containers. GS1-128 does not just identify a product; it encodes detailed product properties such as batch numbers, expiration dates, serial numbers, weights, and destinations.
How GS1-128 Encoding Works
GS1-128 uses Code 128 as its underlying technology but prefixes the data with a special non-data character called "Function 1" (FNC1). FNC1 indicates to the scanner that the subsequent data follows the GS1 format. The data is structured using Application Identifiers (AIs) — two-to-four digit prefixes in parentheses that define the meaning of the data that follows. For example, (01) denotes a GTIN, (10) represents a batch number, and (17) specifies the expiration date.
Common Applications and Industries
GS1-128 is the industry standard for logistics shipping labels (such as Amazon vendor shipping labels or FedEx tracking). Distributors and major retailers scan the GS1-128 barcode at shipping docks to log incoming pallets, verify batch numbers, check product freshness, and automate storage routing. It is also widely used in medical supplies logistics to track surgical implants and critical drugs.
Advantages & Limitations
GS1-128 provides comprehensive logistics tracking by encoding multiple attributes (batch, serial, weight, expiry) in a single linear barcode. It utilizes the highly secure Code 128 symbology, minimizing scan errors. The main disadvantage is that encoding multiple data points makes the barcode very wide, requiring large shipping labels and precise flat placement to scan correctly.