Redacting a barcode

Hi All

I am trying to redact a barcode from scanned pdfs, the barcode is at the bottom of the page
I am using foxit to redact the barcode but cannot seem to get UI to find or select the barcode

I have tried using x and y positions but if the screen resolution changes, it redacts in the wrong place

Has anyone got any ideas on how to redact this? the barcode changes with each document