Add text watermark

GroupDocs.Viewer enables you to apply a watermark on the output pages (HTML / Image / 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);
}

More resources

GitHub Examples

You may easily run the code above and see the feature in action in our GitHub examples:

• GroupDocs.Viewer for .NET examples, plugins, and showcase
• GroupDocs.Viewer for Java examples, plugins, and showcase
• Document Viewer for .NET MVC UI Example 
• Document Viewer for .NET App WebForms UI Modern Example
• Document Viewer for Java App Dropwizard UI Modern Example
• Document Viewer for Java Spring UI Example

Free Online App

Along with full-featured .NET library we provide simple but powerful free Apps. You are welcome to view Word, PDF, Excel, PowerPoint documents with free to use online GroupDocs Viewer App.