Add Text or Image Watermarks to Word Documents using C#

AddWatermarksToDOCX_CSharp.md

Learn how to add text or image watermarks in Word documents using C#: https://blog.conholdate.com/2021/10/22/add-text-or-image-watermarks-in-word-documents-using-csharp/

The following topics are discussed/covered in this article:

1. Add Text Watermark in Word Documents using C#
2. Add Image Watermark in Word Documents using C#
3. Watermark Images in Word Documents using C#
4. Add Watermark to Specific Pages in Word Documents using C#
5. Add Watermark to Headers and Footers of Word Documents using C#

AddWatermarksToDOCX_CSharp_AddImageWatermark.cs

// Create watermarker
Watermarker watermarker = new Watermarker(@"C:\Files\Watermark\sample.docx");

// Create the watermark object
ImageWatermark watermark = new ImageWatermark(@"C:\Files\Watermark\logo.png");

// Set watermark alignment
watermark.HorizontalAlignment = HorizontalAlignment.Center;
watermark.VerticalAlignment = VerticalAlignment.Bottom;

// Set watermark size
watermark.Width = 100;
watermark.Height = 100;

// Add watermark
watermarker.Add(watermark);

// Save the output file
watermarker.Save(@"C:\Files\Watermark\AddImageWatermark_output.docx");

AddWatermarksToDOCX_CSharp_AddTextWatermark.cs

// Creater watermarker
Watermarker watermarker = new Watermarker(@"C:\Files\Watermark\sample.docx");

// Initialize the font to be used for watermark
Font font = new Font("Arial", 19, FontStyle.Bold | FontStyle.Italic);

// Create the watermark object
TextWatermark watermark = new TextWatermark("Simple Text Watermark", font);

// Set watermark properties
watermark.ForegroundColor = Color.Red;
watermark.BackgroundColor = Color.Blue;
watermark.TextAlignment = TextAlignment.Right;
watermark.HorizontalAlignment = HorizontalAlignment.Center;
watermark.VerticalAlignment = VerticalAlignment.Bottom;

// Set watermark size
watermark.Width = 150;
watermark.Height = 40;

// Set opacity level
watermark.Opacity = 0.9;

// Add watermark
watermarker.Add(watermark);

// Save the output file
watermarker.Save(@"C:\Files\Watermark\addTextWatermark_output.docx");

AddWatermarksToDOCX_CSharp_AddWatermarkToHeaderFooter.cs

// Create watermarker
Watermarker watermarker = new Watermarker(@"C:\Files\Watermark\sample.docx");

// Create image watermark
using (ImageWatermark watermark = new ImageWatermark(@"C:\Files\Watermark\logo.png"))
{
    // Set watermark properties
    watermark.Height = 100;
    watermark.Width = 100;
    watermark.HorizontalAlignment = HorizontalAlignment.Right;

    // Add watermark to all headers of the first section
    WordProcessingWatermarkSectionOptions options = new WordProcessingWatermarkSectionOptions();
    options.SectionIndex = 0;
    watermarker.Add(watermark, options);
}

// Link all other headers&footers to corresponding headers&footers of the first section
WordProcessingContent content = watermarker.GetContent<WordProcessingContent>();
for (int i = 1; i < content.Sections.Count; i++)
{
    content.Sections[i].HeadersFooters.LinkToPrevious(true);
}

// Save the output file
watermarker.Save(@"C:\Files\Watermark\AddWatermarkToHeadersFooters_output.docx");

AddWatermarksToDOCX_CSharp_AddWatermarkToImages.cs

// Create watermarker
Watermarker watermarker = new Watermarker(@"C:\Files\Watermark\sample.docx");

// Creater text watermark
TextWatermark watermark = new TextWatermark("Protected image", new Font("Arial", 8));

// Set watermark properties
watermark.ForegroundColor = Color.Black;
watermark.HorizontalAlignment = HorizontalAlignment.Center;
watermark.VerticalAlignment = VerticalAlignment.Center;
watermark.RotateAngle = 45;
watermark.SizingType = SizingType.ScaleToParentDimensions;
watermark.ScaleFactor = 1;

// Find all images in the content.
WatermarkableImageCollection images = watermarker.GetImages();

// Add watermark.
foreach (WatermarkableImage watermarkableImage in images)
{
    watermarkableImage.Add(watermark);
}

// Save the output file
watermarker.Save(@"C:\Files\Watermark\AddWatermarkToImages_output.docx");

AddWatermarksToDOCX_CSharp_AddWatermarkToSpecificPages.cs

// Create watermarker
Watermarker watermarker = new Watermarker(@"C:\Files\Watermark\sample.docx");

// Create text watermark
TextWatermark watermark = new TextWatermark("This is simple watermark!", new Font("Arial", 26));

// Set watermark properties
watermark.ForegroundColor = Color.Red;
watermark.BackgroundColor = Color.Blue;
watermark.TextAlignment = TextAlignment.Right;

watermark.HorizontalAlignment = HorizontalAlignment.Left;
watermark.VerticalAlignment = VerticalAlignment.Top;

// Add watermark to the last page
WordProcessingContent content = watermarker.GetContent<WordProcessingContent>();
WordProcessingWatermarkPagesOptions options = new WordProcessingWatermarkPagesOptions();
options.PageNumbers = new int[] { content.PageCount };

// Add watermark
watermarker.Add(watermark, options);

// Save the output file
watermarker.Save(@"C:\Files\Watermark\AddToSpecificPage_output.docx");