About Barcode Module Width

We often receive questions from customers as to why Dynamic Web TWAIN Barcode add-on is unable to decode their barcode, and the answer is often that the resolution of the original image is too low. Then what is the right resolution for a barcode image?

The resolution alone does not decide the barcode readability but what does matter is how wide the barcode module (x dimension of barcode module width of the tiniest bar) is in the image, as shown in the image below:


Below is the recommended barcode module width for each type:

1D barcode: At least 2 pixels
PDF417: At least 2 pixels
DataMatrix: At least 4 pixels
QRCode: At least 3 pixels