CODE128 vs EAN-13 vs Code 39: Which Barcode Format Should You Use?

These three formats cover the large majority of everyday barcode needs, but they're built for different situations. Here's how to tell them apart.

EAN-13: The Retail Standard

EAN-13 is a strict, 13-digit numeric format used internationally to identify retail products — the barcode printed on nearly everything sold in a store. It requires exactly 13 digits, including a built-in check digit for error detection, and officially requires a registered company prefix through GS1 for real commercial products. If you're labeling a product that will be sold through standard retail channels, EAN-13 is the expected format.

CODE128: The Flexible General-Purpose Option

CODE128 accepts the full ASCII character set — letters, numbers, and symbols — with no fixed length requirement. This flexibility makes it the practical default for anything that isn't a standardized retail product: internal inventory IDs, asset tags, shipping and logistics labels, and general-purpose identifiers where you control both sides of the system (you're generating and scanning the codes yourself).

Code 39: The Simple, Legacy-Friendly Option

Code 39 encodes uppercase letters, numbers, and a limited set of symbols. It's less space-efficient than CODE128 for the same data, but its simplicity makes it easy to implement and widely supported by even older scanning hardware — which is why it still shows up in industrial, government, and some healthcare labeling systems that have used it for decades.

Quick Decision Guide

• Labeling a real retail product? Use EAN-13.
• Internal IDs, asset tags, or general text? Use CODE128 — it's the most flexible and space-efficient choice.
• Working with older scanning equipment or a legacy system that expects it? Code 39 remains a safe, widely compatible option.