Complete GS1 Barcode Guide: UPC, EAN & GTIN Explained (2025)
Everything you need to know about GS1 barcodes, UPC codes, EAN numbers, and GTINs. Learn how to get official GS1 numbers and generate compliant retail barcodes.
What is GS1 and Why Does It Matter?
GS1 is the global organization that manages barcode standards for retail and supply chain. They assign unique company prefixes that ensure your product barcodes are globally unique and recognized by retailers worldwide. Without a GS1 company prefix, major retailers like Walmart, Amazon, and Target will not accept your products.
Understanding GTIN (Global Trade Item Number)
GTIN is the umbrella term for all GS1-managed product identifiers. It includes UPC-A (12 digits, North America), EAN-13 (13 digits, global), and other formats. Every product sold in retail needs a unique GTIN to be tracked through the supply chain and scanned at checkout.
How to Get a GS1 Company Prefix
Visit the GS1 website for your country (e.g., gs1us.org for the United States). Purchase a company prefix based on how many products you plan to sell. The cost varies by country and the number of GTINs you need. Once registered, you can assign unique product numbers under your prefix.
UPC-A vs EAN-13: Which Do You Need?
UPC-A is the standard for products sold in the United States and Canada. It consists of 12 digits. EAN-13 is used everywhere else in the world and has 13 digits. Most modern scanners can read both formats. If you plan to sell globally, EAN-13 is recommended as it is more widely accepted.
Generating GS1-Compliant Barcodes
Once you have your GTIN from GS1, use a barcode generator to create the visual barcode image. Ensure the generator supports GS1 standards and includes the check digit calculation. Download in vector format (SVG) for professional printing. Always verify the barcode scans correctly before mass production.
Common GS1 Barcode Mistakes to Avoid
Never use fake or random UPC/EAN numbers - retailers will reject them. Do not resize barcodes disproportionately (maintain aspect ratio). Avoid low-resolution images that cause scanning errors. Do not print barcodes on reflective or textured surfaces. Always leave adequate quiet zones (white space) around the barcode.
GS1 Barcode Costs and Alternatives
GS1 company prefixes cost between $250-$10,000+ depending on your country and the number of products. Annual renewal fees apply. For small businesses, consider starting with a smaller prefix allocation. For internal inventory (not retail), you can use Code 128 or Code 39 without GS1 registration.