Generate Thumbnails for PDF Files in C#

readme.md

Read the complete article on how to generate thumbnails for PDF file in C# .NET: https://blog.aspose.com/2022/05/16/generate-thumbnails-for-pdf-files-in-csharp/

generate-pdf-thumbnail-all-pages.cs

// Open document
Document pdfDocument = new Document("file.pdf");

// Loop through pages
for (int pageCount = 1; pageCount <= pdfDocument.Pages.Count; pageCount++)
{
    // Create stream for each image
    using (FileStream imageStream = new FileStream("Thumbanils_" + pageCount + ".jpg", FileMode.Create))
    {
        // Create Resolution object
        Resolution resolution = new Resolution(300);

        // Create an instance of JpegDevice and set height, width, resolution, and quality of image
        JpegDevice jpegDevice = new JpegDevice(45, 59, resolution, 100);

        // Convert a particular page and save the image to stream
        jpegDevice.Process(pdfDocument.Pages[pageCount], imageStream);

        // Close stream
        imageStream.Close();
    }
}

generate-pdf-thumbnail.cs

// Open document
Document pdfDocument = new Document("file.pdf");

int pageIndex = 0;

// Get page of desired index from collection
var page = pdfDocument.Pages[pageIndex];

// Create stream for image file
using (FileStream imageStream = new FileStream("Thumbanils_" + page.Number + ".jpg", FileMode.Create))
{
    // Create Resolution object
    Resolution resolution = new Resolution(300);

    // Create an instance of JpegDevice and set height, width, resolution, and quality of image
    JpegDevice jpegDevice = new JpegDevice(45, 59, resolution, 100);

    // Convert a particular page and save the image to stream
    jpegDevice.Process(page, imageStream);

    // Close stream
    imageStream.Close();
}