For Windows users on Version 13 or Nitro PDF Pro 14, you can use the Nitro Activation Portal to check your license status.
If you purchased a physical "boxed" copy from a retail store: how to find my nitro pro serial number
The most reliable way to find your serial number is to search the inbox of the email address used for the purchase. For Windows users on Version 13 or Nitro
Finding your Nitro Pro serial number is essential for re-installing or activating your software on a new device. Because Nitro PDF Pro (v13 and newer) obscures parts of the license key within the application for security, you often need to check external records to find the full 18-digit code. 1. Search Your Email for the Invoice Receipt Because Nitro PDF Pro (v13 and newer) obscures
A window will appear showing the version and a partial serial number (e.g., 504945XXXXXXXXXXXX ). 4. Locate via Windows Registry (Older Versions Only)