In this article you will learn how to convert PDF file in to the JPG without any use of third party library. 

1: Add a button in application

2: Now on button click event past following code lines 

  private async void Button_Click(object sender, RoutedEventArgs e)
        {
            StorageFile file = null;
            FileOpenPicker filePicker = new FileOpenPicker();
            filePicker.FileTypeFilter.Add(".pdf");
            filePicker.ViewMode = PickerViewMode.Thumbnail;
            filePicker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary;
            filePicker.SettingsIdentifier = "picker1";
            filePicker.CommitButtonText = "Open Pdf File";
            file = await filePicker.PickSingleFileAsync();

          await  LoadPdfFileAsync(file);
        }

3: Create a function name like ConvertPDFtoImages and past following code lines 

  private async System.Threading.Tasks.Task LoadPdfFileAsync(StorageFile selectedFile)
        {
            try
            {
                PdfDocument pdfDocument = await PdfDocument.LoadFromFileAsync(selectedFile); ;
                if (pdfDocument != null && pdfDocument.PageCount > 0)
                {
                    for (int pageIndex = 0; pageIndex < pdfDocument.PageCount; pageIndex++)
                    {
                        var pdfPage = pdfDocument.GetPage((uint)pageIndex);
                        if (pdfPage != null)
                        {
                            StorageFolder tempFolder = ApplicationData.Current.TemporaryFolder;
                            StorageFile destinationFile = await KnownFolders.CameraRoll.CreateFileAsync(Guid.NewGuid().ToString() + ".jpg");
                            if (destinationFile != null)
                            {
                                IRandomAccessStream randomStream = await destinationFile.OpenAsync(FileAccessMode.ReadWrite);
                                PdfPageRenderOptions pdfPageRenderOptions = new PdfPageRenderOptions();
                                pdfPageRenderOptions.DestinationWidth = (uint)(this.ActualWidth - 130);
                                await pdfPage.RenderToStreamAsync(randomStream, pdfPageRenderOptions);
                                await randomStream.FlushAsync();
                                randomStream.Dispose();
                                pdfPage.Dispose();
                            }
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }        

4: Open project manifest file and got to "Capabilities" tab set "Picture Library" check box checked 

Run your application and convert PDF file to JPG

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