Conversion of pkpass files to jpg file format

It is unlikely that you can directly convert .pkpass files as  .jpg files with some kind pkpass to jpg converter. Services based on Apple Passbook often provide users with PDF files in confirmation e-mails, as well as the possibility to print additional PDF ticket from the users account. One important detail is that .pkpass files are ZIP archives, which means you can view or extract the contents using any utility with support of ZIP format, or even by default in latest versions of MS Windows. Inside the folders, there may be a single .png image that can be easily converted to jpg.

Open PKPASS file    Open JPG file