Extracting Images from a PDF Document and Saving Them as Image Files

Updated on Jun 5, 2026

Environment

Version	Product	Author
2023.3.1106	RadPdfProcessing	Desislava Yordanova

Description

This article demonstrates how to extract images from a PDF document and save them as separate image files.

Solution

Use the following code snippet to extract images from each page of a PDF document and save them as image files:

csharp

static void Main(string[] args)
{
    List<byte[]> extractedImages = new List<byte[]>();

    PdfFormatProvider formatProvider = new PdfFormatProvider();
    string filePath = @"..\..\sample.pdf";
    using (FileStream pdfStream = File.Open(filePath, FileMode.Open))
    {
        RadFixedDocument document = formatProvider.Import(pdfStream);

        // Iterate through each page in the document
        foreach (RadFixedPage page in document.Pages)
        {
            foreach (var contentElement in page.Content)
            {
                Telerik.Windows.Documents.Fixed.Model.Objects.Image imageContent = contentElement as Telerik.Windows.Documents.Fixed.Model.Objects.Image;
                if (imageContent != null)
                {
                    EncodedImageData imageData = imageContent.ImageSource.GetEncodedImageData();
                    byte[] imageBytes = imageData.Data;
                    extractedImages.Add(imageBytes);

                    SaveImageToFile(imageContent, imageData);
                }
            }
        }
    }
}

static int counter = 0;
private static void SaveImageToFile(Image image, EncodedImageData encodedImageData)
{
    string outputDirectoryName = @"..\..\{sample folder here}";
    bool isTransperant = image.ImageSource.GetEncodedImageData().AlphaChannel != null;
    if (encodedImageData.Filters.Contains("DCTDecode") && !isTransperant)
    {
        File.WriteAllBytes(Path.Combine(outputDirectoryName, $"fileName{++counter}.jpeg"), encodedImageData.Data);
    }
    else if (encodedImageData.Filters.Contains("FlateDecode") | isTransperant)
    {
        BitmapSource bitmapSource = image.GetBitmapSource();
        using (FileStream fileStream = new FileStream(Path.Combine(outputDirectoryName, $"fileName{++counter}.png"), FileMode.Create))
        {
            BitmapEncoder encoder = new PngBitmapEncoder();
            encoder.Frames.Add(BitmapFrame.Create(bitmapSource));
            encoder.Save(fileStream);
        }
    }
    else if (encodedImageData.Filters.Contains("JPXDecode"))
    {
        File.WriteAllBytes(Path.Combine(outputDirectoryName, $"fileName{++counter}.jp2"), encodedImageData.Data);
    }
}

Replace the filePath variable with the actual path to your PDF document.

The above code snippet for the FlateDecode filter is compatible with .NET Framework because the image data extracted from the PDF is encoded. To use the image data, decode it first and then encode it with the desired image format.

The current implementation of the .NET Standard version of the PdfProcessing library does not provide an option to get the decoded image data of images with the FlateDecode filter applied. You can create a custom method to decode the flate-encoded data.

For more information about converting images and scaling their quality, see the Cross-Platform Images documentation.

See Also

• Cross-Platform Images
• RadPdfProcessing Overview