Add text watermark

GroupDocs.Viewer enables you to add a watermark the output HTML/JPG/PNG/PDF.

Here is the recipe:

• Create instance of HtmlViewOptions class (or PngViewOptions, or JpgViewOption, or PdfViewOptions);
• Create a Watermark object and populate its properties;
• Assign Watermark object to HtmlViewOptions.Watermark (or PngViewOptions.Watermark, or JpgViewOptions.Watermark, or PdfViewOptions.Watermark) property;
• Call View method.

The following code sample shows how to apply the watermark to the output pages.

using (Viewer viewer = new Viewer("sample.docx"))
{
    HtmlViewOptions viewOptions = HtmlViewOptions.ForEmbeddedResources();
    viewOptions.Watermark = new Watermark("This is a watermark");
                
    viewer.View(viewOptions);
}