PDFpen 13.1, released by Smile Software in mid-2021, introduced several performance enhancements and new features for Mac users. This version also marked a significant transition period for the application following its acquisition by Nitro Software . Key Features and Improvements
: Users of PDFpen 13.1 can use the Nitro Migration Assistant to move their library items, stamps, and user preferences to the newer Nitro application. PDFpen 13.1
: Some users reported instability or freezing on early M1 Mac systems. PDFpen 13
Following the 13.1 release, the application was rebranded as . released by Smile Software in mid-2021