Add text watermark

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

Here is the recipe:

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);
}