GroupDocs.Watermar API Supports adding the following image file types as image watermark:
Bmp; Png; Gif; Jpeg. Add image watermark from local file Following code snippet shows how to add ImageWatermark to a Document. If the Document consists of multiple parts (pages, worksheets, slides, frames etc), the watermark will be added to all of them.
advanced_usage.adding_image_watermarks.AddImageWatermark
// Specify an absolute or relative path to your Document. Ex: "C:\\Docs\\Presentation.pptx" Watermarker watermarker = new Watermarker("Presentation....Order Support Docs API Reference Live Demos Free Support Free...Free Consulting Paid Support Paid Consulting Blog Knowledge Base...