UPDATE: Please read this:
We regret to inform you that as of August 26th, 'Print to PDF' is no longer available on the Apple App Store. On August 24th, we received a call from Apple Developer Relations telling us that we are not allowed to use AirPrint as a way to print documents to PDF and that for this reason the app could no longer be available on the App Store.
This news came as a surprise to us given that the app had been reviewed and approved 3 times already by the Apple App Review Team. Unfortunately, we have to comply with this decision and the app will no longer be available for download.
If you already have the app installed on your device you can continue to use it, however, we will not be able to provide any further updates for now.
Thanks for your understanding,