Barcode Types Explained: Which One Does Your Business Actually Need?
Walk down any supermarket aisle and you'll see barcodes on nearly everything, but not all barcodes are the same. Different formats exist because different industries need to encode different kinds of information — retail products, shipping crates, pharmaceutical packaging, and library books all rely on their own specialized barcode standards. Picking the wrong one can mean your barcode simply won't scan on the equipment it's meant for.
Why So Many Formats Exist
Barcodes are one-dimensional, meaning they only encode data along a single line using varying widths of bars and spaces. Because that's a fairly limited amount of space to work with, different formats were developed over time to optimize for specific needs: some maximize how many characters can fit, some are built for speed and reliability in industrial settings, and some are locked to strict numeric standards required by international retail systems.
The Most Common Formats
EAN-13 and UPC-A These are the two formats you see on nearly every retail product worldwide. UPC-A (12 digits) is the standard in the United States and Canada, while EAN-13 (13 digits) is the international standard used almost everywhere else, including Europe and Asia. If you're manufacturing a physical product meant for retail shelves, you'll need one of these, and the numbers themselves usually have to be registered through a numbering authority like GS1 rather than made up freely.
Code 128 A dense, flexible format that can encode the entire ASCII character set — letters, numbers, and symbols. Because it packs so much data into a small space, Code 128 is widely used in shipping, logistics, and inventory management, where labels need to fit serial numbers, batch codes, or tracking IDs in a compact area.
Code 39 An older, simpler format still common in non-retail settings like inventory tracking, ID badges, and some government and defense applications. It's less space-efficient than Code 128 but is easy to print and scan reliably even on lower-quality printers, which is part of why it's stuck around for internal-use cases.
Interleaved 2 of 5 (ITF) Used almost exclusively for numeric data, ITF is common on outer shipping cartons and warehouse packaging, since it's designed to be read reliably at a distance and under less-than-ideal lighting conditions on a factory or warehouse floor.
Codabar Still used in some specific legacy systems, most notably blood banks, some library systems, and certain courier services. It's not commonly chosen for new projects but remains relevant if you're integrating with older infrastructure that already depends on it.
PZN and Pharmacode Specialized formats used in the pharmaceutical industry for tracking medication packaging, often required by regulation in specific countries rather than chosen freely.
How to Choose the Right One
Ask what the barcode needs to connect to. If you're selling a physical product through retail stores, you don't really have a choice — UPC-A or EAN-13 will be required by the retailer's point-of-sale systems. If you're building an internal inventory or asset-tracking system, Code 128 is usually the best modern default because of its flexibility and data density. If you're working with older scanning hardware that only supports simpler formats, Code 39 remains a safe, dependable fallback.
A Common Mistake
A frequent error is treating barcode numbers as if they can be made up freely. For retail formats like UPC-A and EAN-13, the numbers follow a strict structure — including a country/manufacturer prefix and a checksum digit calculated from the other numbers — and are meant to be issued through an official registrar. Generating a barcode with a random number that happens to "look right" may scan fine on your own test device, but it can cause conflicts or outright rejection when it reaches a retailer's system, since that number may already belong to a different registered product elsewhere in the world.
Testing Before You Print
Regardless of which format you choose, always test a generated barcode with an actual scanner (or a scanning app) before committing to a full print run. Barcode readability depends heavily on print resolution, size, and contrast — a barcode that looks fine on screen can become unreadable if printed too small or with insufficient contrast between the bars and the background.