Short answer: No, not immediately.
If you activate Nitro Pro 13 and then disconnect from the internet forever, it will continue to work for approximately 30–45 days. After the grace period, if the license check cannot phone home, it will enter a “reduced functionality mode” (you can view PDFs but not edit or convert).
This is intentional. It prevents someone from buying one license, activating 100 VMs offline, and never paying again. Nitro Pro 13 License Check
Nitro licenses have activation limits. If you use the same serial number on more machines than allowed (typically 2 per single-user license), the oldest activation may be automatically deactivated without warning.
When a license check fails, Nitro Pro 13 typically displays an error code or message. Here are the most common ones: Short answer: No, not immediately
| Error Message | Meaning | |----------------|------------------------------------------------| | “License is invalid or not found” | The serial number is mistyped, corrupted, or not recognized by Nitro’s servers. | | “Maximum number of activations reached” | Your license key has been used on too many devices. | | “License server unreachable” | Network or firewall blocks communication with Nitro’s activation servers. | | “This license has been revoked” | The serial number was reported stolen, refunded, or flagged for fraudulent use. | | “Hardware ID mismatch” | Significant hardware changes triggered a new license check requirement. |
Did you perform the check only to realize you don't have your serial number written down? Don't panic. This is intentional
If you perform the license check and the software indicates it is unlicensed or in Trial Mode, here is how to fix it:
If you are relying on Nitro Pro 13 for your daily PDF editing, signing, and creation needs, you know how powerful this software is. However, nothing interrupts a workflow faster than a sudden "Trial Mode" notification or a request to activate your software.
Whether you are troubleshooting an activation error or simply verifying that your software is properly registered, performing a Nitro Pro 13 license check is a straightforward process.
In this guide, we will walk you through how to find your license details within the software, what to do if your license isn’t recognized, and how to differentiate between a genuine license and a trial version.