your current version of Nitro Pro via the Windows Control Panel.
: Select Preferences from the bottom of the left-hand menu sidebar.
Go to File > Document Properties > Accessibility .
If you have just installed Nitro PDF Pro for the first time, you won't need to navigate through menus. During the very first launch after installation, the software will typically prompt you to select your preferred language from a list before you can start using it.
Click the File tab in the top-left corner of the ribbon.
For more detailed troubleshooting or to find specific language-based installers, you can visit the Nitro Community Forums . Setting the Document Language
For a quick reference, here is a summarized table of the steps:
Click on the File menu in the top left corner.
Visit the Nitro Support Downloads page and select the specific language installer you need. Reinstall the software using that version.
Even if your interface is in English, you might be working on a document written in French, Spanish, or German. To ensure Nitro recognizes text correctly during OCR (Optical Character Recognition) or marks typos accurately, you must update these specific settings. To Change Spellcheck: Go to . Select Spellcheck from the left-hand menu. Check the box for Enable Spellcheck .
In newer versions of Nitro PDF Pro (starting from build 13.70.2.40), you can change the application interface language directly within the settings. Change Interface Language