Nitro PDF Pro Essentials 13.3.0 is a specific, older version of the Mac-based Nitro PDF Pro (formerly PDFpenPro), primarily noted around August 2022 for its role in migrating users from Smile Software's PDFpenPro to the Nitro ecosystem.
Users reported that 13.3.0 accepted PDFpenPro registration keys, allowing for a seamless transition. Nitro PDF Pro Essentials 13.3.0
✅ Capable editing, annotation, and conversion (PDF to Word/Excel) tools. Nitro PDF Pro Essentials 13
This version is associated with the transition period from PDFpenPro to Nitro and is no longer the current version (latest is v14+ in 2025/2026). This version is associated with the transition period
To give you the most relevant information, are you asking about this version because you are: from an old PDFpen license? Experiencing technical issues with a 13.3.0 installation? Considering a purchase of a "lifetime/perpetual" license? Let me know so I can help with specific advice! Nitro PDF Pro and PDF Pro Essentials 13.3 - TidBITS Talk
It is designed for Optical Character Recognition (making scans searchable) and general PDF editing on macOS.