Your ability to scan a barcode will vary depending upon its size, design, scanning device quality and patience of the person doing the scanning. We recommend a minimum height or width of 0.625" (16mm). If your barcode is small we recommend placing a test order to verify how easy it will be to scan. You can order 10 custom samples starting at $9 here.
QR codes are easier to scan and are a great alternative to barcodes.