Create PDF with different size pages based on input file

While adding the Image to itextsharp document please set the page size (Same code applicable for all the document types)

//input image document path

string imagePath = Server.MapPath(strinputDocumentPath);

iTextSharp.text.Image img = iTextSharp.text.Image.GetInstance(imagePath);

//Getting Width of the image width adding the page right & left margin

var width = img.ScaledWidth

                  + pdfdoc.RightMargin

                  + pdfdoc.LeftMargin;

               

//Getting Height of the image height adding the page top & bottom margin

var height = img.ScaledHeight

                  + pdfdoc.TopMargin

                  + pdfdoc.BottomMargin;

              

               

//Creating pdf rectangle with the specified height & width for page size declaration

iTextSharp.text.Rectangle r = new iTextSharp.text.Rectangle(width, height);

               

/*you __MUST__ call SetPageSize() __BEFORE__ calling NewPage()

* AND __BEFORE__ adding the image to the document

*/

//Changing the page size of the pdf document based on the rectangle defined

pdfdoc.SetPageSize(r);

pdfdoc.NewPage();

pdfdoc.Add(img);

On creating every new page in document please set the page size as follows based on the page needs, you can also specify the height and width of the pdf rectangle

//To set the page size of the document

pdfdoc.SetPageSize(new iTextSharp.text.Rectangle(PageSize.A4));

pdfdoc.NewPage();