1. GroupDocs Documentation
    2. /
    3. GroupDocs.Watermark Product Family
    4. /
    5. GroupDocs.Watermark for .NET
    6. /
    7. Developer guide
    8. /
    9. Advanced usage
    10. /
    11. Adding watermarks
    12. /
    13. To images
    14. /
    15. To images inside a document

    Adding watermark to images inside a document

    The most of the document formats allow you to place images inside a document. If you want to add watermark to images inside a document then it can be possible using GroupDocs.Watermark. Following are the steps to add watermark to the images of any document.

    1. Load the document
    2. Create and initialize watermark object
    3. Set watermark properties
    4. Find images in the document
    5. Add watermark to all found images
    6. Save the document

    AdvancedUsage.AddingWatermarks.AddWatermarksToImages.AddWatermarkToImagesInsideDocument

    // Specify an absolute or relative path to your document. Ex: @"C:\Docs\document.pdf"
using (Watermarker watermarker = new Watermarker("document.pdf"))
{
    // Initialize text watermark
    TextWatermark textWatermark = new TextWatermark("Protected image", new Font("Arial", 8));
    textWatermark.HorizontalAlignment = HorizontalAlignment.Center;
    textWatermark.VerticalAlignment = VerticalAlignment.Center;
    textWatermark.RotateAngle = 45;
    textWatermark.SizingType = SizingType.ScaleToParentDimensions;
    textWatermark.ScaleFactor = 1;

    // Initialize image watermark
    using (ImageWatermark imageWatermark = new ImageWatermark("protect.jpg"))
    {
        imageWatermark.HorizontalAlignment = HorizontalAlignment.Center;
        imageWatermark.VerticalAlignment = VerticalAlignment.Center;
        imageWatermark.RotateAngle = -45;
        imageWatermark.SizingType = SizingType.ScaleToParentDimensions;
        imageWatermark.ScaleFactor = 1;

        // Find all images in a document
        WatermarkableImageCollection images = watermarker.GetImages();
        for (int i = 0; i < images.Count; i++)
        {
            if (images[i].Width > 100 && images[i].Height > 100)
            {
                if (i % 2 == 0)
                {
                    images[i].Add(textWatermark);
                }
                else
                {
                    images[i].Add(imageWatermark);
                }
            }
        }
    }

    watermarker.Save("document.pdf");
}
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