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C# PDF Thumbnail Image Library
How to get, create, generate, preview thumbnail image from pdf file pages using c# .net


C# Demo Code to enable PDF thumbnail generator viewers in C# class, ASP.NET online pages in .NET Project





In this tutorial, you learn how to use XDoc.PDF thumbnail C# library to

  • Create thumbnail images from PDF file
  • Create, store thumbnail data into PDF document
  • Remove thumbnail data from PDF document

How to create thumbnail image from PDF file using C#

  1. Download XDoc.PDF thumbnail image converter C# library
  2. Install C# library to create thumbnail images from PDF document
  3. Step by Step Tutorial


























  • Advanced C#.NET framework PDF SDK for thumbnail icon generation & creator from PDF document pages in Visual Stutio .NET framework
  • Easy .net sdk library for showing, previewing PDF page thumbnails for navigation in both .NET WinForms application and ASP.NET webpage
  • C# library includes: c# extract pdf page as image, c# pdf add background, c# rotate pdf page, how to remove pages from pdf in c#, c# pdf page size.
  • Support ASP.NET Core MVC, .NET WinForms, ASP.NET MVC in IIS, ASP.NET Ajax, Azure cloud service, DNN (DotNetNuke), SharePoint
  • Create, show, display multiple image formats thumbnails for PDF file, such as jpeg, png, gif, bmp, etc
  • C# sample code included for quick creating PDF thumbnail viewer in Visual C# .NET class
  • Able to control the size of PDF thumbnails in C#.NET console application and ASPX webpage
  • Built on .NET framework 2.0 and support Windows 32-bit and 64-bit systems


Page thumbnails are miniature previews of the PDF pages in a document. In PDF reader web applications (such as EdgePDF ASP.NET PDF Editor), you can use page thumbnails to navigate quickly to a selected PDF page or to adjust the view of the PDF page. When you move, copy, or delete a page thumbnail, you move, copy, or delete the corresponding PDF page.

Using XDoc.PDF SDK, you can easily add, insert a new page thumbnail to an existing PDF file. Create thumbnails from a PDF file, move, delete thumbnails in PDF document.





Create a page thumbnail image using C#


The following C# source code will create a PDF thumbnail, draw and output to a Bitmap object.



String inputFilePath = Program.RootPath + "\\" + "1.pdf";
PDFDocument doc = new PDFDocument(inputFilePath);
PDFPage page = (PDFPage)doc.GetPage(0);

//  define the size of the thumbnail
Size thumbnailSize = new Size(80, 100);
//  create the thumbnail
Bitmap thumbnail = page.ConvertToImage(thumbnailSize);
//  do something ...






Add page thumbnails in a PDF document


In a PDF document, each PDF page can have 0 or 1 thumbnail image. If you add a new thumbnail to a PDF page, the new thumbnail image will replace the previous one, if the page has an existing thumbnail image.







Add thumbnail for single page




String inputFilePath = Program.RootPath + "\\" + "1.pdf";
String outputFilePath = Program.RootPath + "\\" + "1_thumbnail.pdf";

PDFDocument doc = new PDFDocument(inputFilePath);

//  add thumbnail for the first page
int pageIndex = 0;
PDFThumbnailHandler.UpdateThumbnail(doc, pageIndex);

doc.Save(outputFilePath);






Add thumbnail for multi-pages




String inputFilePath = Program.RootPath + "\\" + "1.pdf";
String outputFilePath = Program.RootPath + "\\" + "1_thumbnail.pdf";

PDFDocument doc = new PDFDocument(inputFilePath);

//  add thumbnail for multi pages 
int[] pageIndexes = new int[3] { 0, 3, 5 };
PDFThumbnailHandler.UpdateThumbnail(doc, pageIndexes);

doc.Save(outputFilePath);






Add thumbnail for all pages




String inputFilePath = Program.RootPath + "\\" + "1.pdf";
String outputFilePath = Program.RootPath + "\\" + "1_thumbnail.pdf";

PDFDocument doc = new PDFDocument(inputFilePath);

//  add thumbnail for all pages 
PDFThumbnailHandler.UpdateThumbnail(doc);

doc.Save(outputFilePath);





Remove page thumbnails in a PDF document


The C# example source code will demo how to remove PDF page thumbnails from a PDF document using C#.



String inputFilePath = Program.RootPath + "\\" + "1_thumbnail.pdf";
String outputFilePath = Program.RootPath + "\\" + "1_no_thumbnail.pdf";

PDFDocument doc = new PDFDocument(inputFilePath);

//  remove thumbnail for all pages 
PDFThumbnailHandler.RemoveThumbnail(doc);

doc.Save(outputFilePath);




C# create Adobe pdf file thumbnail images with specified image size (width, height)


The following C# source code shows how to create PDF page thumbnail images with specified image width and height.



        #region generated pdf file thumbnails with specified image size
        internal static void generatePdfThumbnailWithSpecifiedSize()
        {
            String inputFilePath = @"C:\demo.pdf";
            PDFDocument doc = new PDFDocument(inputFilePath);
            for (int i = 0; i < doc.GetPageCount();i++ )
            {
                BasePage page = doc.GetPage(i);
                Bitmap image = page.ConvertToImageFitWidth(100);
            }
        }
        #endregion




C# generate, get pdf thumbnail files for selected PDF pages


The C# code below shows to generate pdf page thumbnail files from selected PDF pages.



        #region generated pdf file page's thumbnails with specified image size
        internal static void generatePdfPageThumbnailWithSpecifiedSize()
        {
            String inputFilePath = @"C:\demo.pdf";
            PDFDocument doc = new PDFDocument(inputFilePath);
            int pageIndex = 2;
            BasePage page = doc.GetPage(pageIndex);
            Bitmap image = page.ConvertToImageFitWidth(100);
        }
        #endregion





Remove page thumbnails in a PDF document


Using the following C# source code, you can easily remove page thumbnails in a PDF document.



String inputFilePath = Program.RootPath + "\\" + "1_thumbnail.pdf";
String outputFilePath = Program.RootPath + "\\" + "1_no_thumbnail.pdf";

PDFDocument doc = new PDFDocument(inputFilePath);

//  remove thumbnail for all pages 
PDFThumbnailHandler.RemoveThumbnail(doc);

doc.Save(outputFilePath);





Get page thumbnail in a PDF document


If you need read, extract the exsting thumbnail image from a PDF page, you can try the following C# source code.



String inputFilePath = Program.RootPath + "\\" + "1_thumbnail.pdf";

PDFDocument doc = new PDFDocument(inputFilePath);

//  get thumbnail of the first page if have
int pageIndex = 0;
Bitmap thumbnail = PDFThumbnailHandler.GetThumbnail(doc, pageIndex);
if (thumbnail != null)
{
    Console.WriteLine("Page has thumbnail");
    Console.WriteLine("Width: " + thumbnail.Width + "; Height: " + thumbnail.Height);
}
else
{
    Console.WriteLine("No thumbnail exist");
}