Choose the format the workflow expects.
Use UPC-A or EAN-13 for retail products, ISBN for books, ITF-14 for cartons, Code 39 for constrained legacy systems, and Code 128 for compact campaign or inventory identifiers. A URL still belongs in a QR code.
01
Use a concise value
Short identifiers produce less dense bars and are generally easier to reproduce.
02
Preserve clear margins
Do not crop the open space on either side of the downloaded barcode.
03
Print at high contrast
Dark bars on a clean light background provide the strongest scanner reliability.