Image Merger
How to Merge Images and Export as PDF in .NET

How to Merge Images and Export as PDF in .NET

Turning images into a multi-page PDF is ideal for creating albums, reports, brochures, and easy sharing. Aspose.Imaging for .NET lets you merge any batch of images and export them as a polished PDF in just a few lines of code.

Real-World Problem

Sending multiple photos as attachments or gallery links is often messy. A single PDF keeps everything together and looks professional on any device.

Solution Overview

Load your images, create a PDF, and add each image as a new page. You can customize page size, alignment, and even add blank pages or covers if needed.

Prerequisites

  1. Visual Studio 2019 or later
  2. .NET 6.0 or later (or .NET Framework 4.6.2+)
  3. Aspose.Imaging for .NET from NuGet
  4. Folder of images to merge
PM> Install-Package Aspose.Imaging

Step-by-Step Implementation

Step 1: Prepare Your Images

Place all images you want in the PDF in a folder, and sort or name them in the order you want them to appear.

string[] files = Directory.GetFiles("./input", "*.jpg");

Step 2: Load Images and Set Up PDF Export 

using Aspose.Imaging;
using Aspose.Imaging.ImageOptions;
using Aspose.Imaging.FileFormats.Pdf;

var images = files.Select(f => Image.Load(f)).ToList();
var pdfOptions = new PdfOptions();
string pdfPath = "./output/merged_images.pdf";

Step 3: Save All Images to PDF 

using (var pdfDocument = Image.Create(pdfOptions, images[0].Width, images[0].Height, false))
{
    var graphics = new Aspose.Imaging.Graphics(pdfDocument);
    graphics.DrawImage(images[0], 0, 0, images[0].Width, images[0].Height);

    for (int i = 1; i < images.Count; i++)
    {
        pdfDocument.AddPage(images[i]);
    }
    pdfDocument.Save(pdfPath);
}
images.ForEach(img => img.Dispose());

Step 4: Test and Review Your PDF

Open the resulting PDF in any viewer to confirm order, size, and quality. Make sure each image fits the page as intended.

Use Cases and Applications

  • Photo albums for events, weddings, or vacations
  • Technical or marketing brochures with images
  • Visual product catalogs for e-commerce
  • Galleries or design previews to share with clients

Common Challenges and Solutions

Images look stretched or cut off: Resize images before adding, or adjust page size as needed for each image.

Large PDF file size: Lower image resolution or use compression options during export.

Wrong image order: Sort file names or list explicitly before loading.

Best Practices

  • Name images with a numbering system for correct PDF order
  • Resize or crop images for consistent page appearance
  • Always preview the finished PDF in multiple viewers

FAQ

Q: Can I add text or cover pages? A: Yes. Draw text using Aspose.Imaging.Graphics before adding each page, or insert a cover as the first image.

Q: Can I mix image formats (JPG, PNG, etc.)? A: Yes. Aspose.Imaging will handle supported types for you.

Q: Can I control the PDF’s page size or orientation? A: Yes. Set size options in PdfOptions, or adjust per image as needed.

Conclusion

Merging images and exporting as a multi-page PDF is simple and effective with Aspose.Imaging for .NET. This approach keeps your galleries, albums, and catalogs portable and professional for any audience. For more on PDF export and customization, check the Aspose.Imaging for .NET API Reference .

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