As far as we could gather, jnt to pdf conversion is related to export of Windows Journal documents (.jnt) to PDF format (.pdf).
The most convenient way to convert jnt to pdf is open the file in Microsoft Windows Journal app (needs to be installed in some versions of Windows) and simply use the print function with a virtual PDF printer installed.
You can use the Free PDF Converter on-line service to transform notes created in the Microsoft Windows Journal application to Portable Document File format. But as is the case with pretty much any web service, the results may wary.
Updated: March 31, 2017