Convert XLTX to PPTX on .NET Framework, .NET Core, Mono or Xamarin Platforms or online. Test free XLTX to PPTX online converter quickly before integrating the code....Convert XLTX to PPTX on .NET Framework, .NET Core, Mono or Xamarin Platforms or online. Test free XLTX to PPTX online converter quickly before integrating the code.