C#/VB.NET: Convert Multiple Images into a Single PDF

If you have multiple images that you want to combine into one file for easier distribution or storage, converting them into a single PDF document is a great solution. This process not only saves space but also ensures that all your images are kept together in one file, making it convenient to share or transfer. In this article, you will learn how to combine several images into a single PDF document in C# and VB.NET using Spire.PDF for .NET.

Install Spire.PDF for .NET

To begin with, you need to add the DLL files included in the Spire.PDF for.NET package as references in your .NET project. The DLL files can be either downloaded from this link or installed via NuGet.

PM> Install-Package Spire.PDF

Combine Multiple Images into a Single PDF in C# and VB.NET

In order to convert all the images in a folder to a PDF, we iterate through each image, add a new page to the PDF with the same size as the image, and then draw the image onto the new page. The following are the detailed steps.

  • Create a PdfDocument object.
  • Set the page margins to zero using PdfDocument.PageSettings.SetMargins() method.
  • Get the folder where the images are stored.
  • Iterate through each image file in the folder, and get the width and height of a specific image.
  • Add a new page that has the same width and height as the image to the PDF document using PdfDocument.Pages.Add() method.
  • Draw the image on the page using PdfPageBase.Canvas.DrawImage() method.
  • Save the document using PdfDocument.SaveToFile() method.
  • C#
  • VB.NET
using Spire.Pdf;
using Spire.Pdf.Graphics;
using System.Drawing;

namespace ConvertMultipleImagesIntoPdf
    class Program
        static void Main(string[] args)
            //Create a PdfDocument object
            PdfDocument doc = new PdfDocument();

            //Set the page margins to 0

            //Get the folder where the images are stored
            DirectoryInfo folder = new DirectoryInfo(@"C:\Users\Administrator\Desktop\Images");

            //Iterate through the files in the folder
            foreach (FileInfo file in folder.GetFiles())
                //Load a particular image 
                Image image = Image.FromFile(file.FullName);

                //Get the image width and height
                float width = image.PhysicalDimension.Width;
                float height = image.PhysicalDimension.Height;

                //Add a page that has the same size as the image
                PdfPageBase page = doc.Pages.Add(new SizeF(width, height));

                //Create a PdfImage object based on the image
                PdfImage pdfImage = PdfImage.FromImage(image);

                //Draw image at (0, 0) of the page
                page.Canvas.DrawImage(pdfImage, 0, 0, pdfImage.Width, pdfImage.Height);
            //Save to file

C#/VB.NET: Convert Multiple Images into a Single PDF

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