PrimoPDF is a freeware program that creates a PDF file from Microsoft Windows documents. It works as a virtual printer. It does not present the user with advertisements. But does utilize the Open Candy Network and per its terms of service, may use Open Candy to recommend other software to the user. PrimoPDF is developed by the same company that develops the commercial Nitro PDF software.PrimoPDF requires the Microsoft .NET Framework 2.0.