Within the Preferences window, look for the Language option on the left-hand menu.

Visit the Nitro Support Downloads page and download the for your specific preferred language. Reinstall the software using that version. Setting the Document Language - Nitro PDF

To change the language used for Optical Character Recognition (text recognition), go to File > Preferences > OCR and select your language from the list. If you'd like, I can help you: Setting the Document Language - Nitro PDF

Launch the application on your Windows computer.

Click on the File tab in the top-left corner.

Under the section, check the boxes for the languages you want Nitro to recognize.

: Click on your user profile icon or avatar in the top-right corner.

This guide will walk you through on both Windows and Mac, step-by-step.

Before diving into complex fixes, try the official method. The "New Nitro PDF" (Version 14+) has a hidden language selector.

In the latest versions of Nitro PDF Pro (specifically build 13.70.2.40 and newer), you can change the interface language directly within the application's settings. Previously, users had to uninstall and reinstall the entire program using a specific language installer, but the new unified installer supports multiple languages. How to Change the Interface Language