Scannability
How big do I need to make the QR code?
PDF QR code size can be defined as big or as small as you want. Depending on how big the credential payload is, you might need to make the QR code bigger. We recommend starting at 33 mm (1.3 in) and adjust bigger/smaller depending on space available and testing scannability with the encoded payload (whether the camera app can scan the QR code).
We recommend an absolute minimum size of 30 mm (1.25 in).
Note: QR codes generated would have a ~1 mm (~0.04 in) spacing around all 4 sides, so adjust your qrCode form field with that in mind.
Apple digital pass
Apple Pass’s QR code is fixed and can’t be made bigger or smaller. It is worth noting that even though it looks small in size, if the QR code is scannable at ~33 mm with a printed PDF, then end users should not have any issues scanning an Apple digital pass. This is due to Apple devices having a higher pixel density and being able to display it at a higher resolution.
Google digital pass
Google Pass’s QR code is fixed and can’t be made bigger or smaller. However, Google designed the Google Pay app to display the QR codes fairly big. Same as Apple digital passes, if the QR code is scannable at ~33 mm with a printed PDF, then the end user should not have any issues scanning a Google digital pass.