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Barcode guides

Plain-English answers about barcodes: which type to use, where product numbers come from, and how to print barcodes that scan.

KarTrak, an early barcode used on American railway wagons from the late 1960s — KarTrak, an early barcode used on American railway wagons from the late 1960s.

All guides

What is a UPC code?A UPC is the 12-digit number under the barcode on almost every product sold in North America. Here's what each digit means, where UPCs come from, and when you need one.
Barcode types: which one should you use?There are dozens of barcode types, but almost every job is done by one of about ten. Here's what each is for, with a quick way to choose.
UPC vs EAN: what's the difference?UPC and EAN are two versions of the same system. A UPC has 12 digits, an EAN has 13, and scanners worldwide read both. Here's when it matters.
Code 128 vs Code 39Both encode letters and numbers, and both are free for anyone to use. Code 128 is newer, smaller and more flexible; Code 39 is simpler and still required by some systems.
How to make a barcodeMaking the barcode image takes a minute. Getting the number, size and printing right takes a little more care. Here's the whole process, plus how to use your barcode in Word, Excel and Canva.
How to get a barcode for your productIf you're launching a product for shops, Amazon or Google Shopping, you need a GS1 barcode number, a GTIN. Here's how to get one, how many you need, and what to avoid.

Tools

Every barcode type and job has its own preset generator.

Code 128 · Letters, numbers and symbols (any printable ASCII)Make a Code 128 barcode

Container cranes at the Port of Southampton — Container cranes at the Port of Southampton.

Pallet racking in a distribution warehouse — Pallet racking in a distribution warehouse.