Why can't the barcode or QR code on the printed label be scanned?

1. Try to choose PDF file format for printing instead of PNG, PIG, and other image formats, when the barcode you print out is very fuzzy (please refer to the picture）

2. The reason the barcode can't be scanned is that the printer's density and speed settings are not suitable for the current shipping label, we need to adjust it in the printer settings

Please refer to  How to adjust the density and speed in the settings?

Here are the best settings for each platform