Barcode types

Open Barcode generates three linear barcode types in all five languages. Each page explains the input rules, the check digit and the module count.

UPC-A encodes 12 digits: 11 data digits and a check digit. Open Barcode computes the check digit, or verifies it when you pass all 12 digits.

EAN-13 encodes 13 digits: 12 data digits and a check digit. It is the retail barcode used worldwide and is defined by GS1.

Code 39 is a variable-length alphanumeric barcode. It encodes letters, digits and a few symbols, and is common in logistics and industry.