Leave plenty of white space on the left and right sides of the barcode so the scanner can "reset" before reading.
Always print a test sheet and verify it with a physical scanner or a smartphone app before printing a large batch of labels. If you'd like, I can help you: Find a specific font type (Code 39, Code 128, etc.) Write an Excel formula for your specific data Troubleshoot why your scanner won't read the printed font download barcode font
These are the standard codes found on retail products. These fonts are highly specific and usually require a check digit to function at a retail point-of-sale. Leave plenty of white space on the left