Add watermark

GroupDocs.Conversion allows you to apply a watermark to the converted document.  You can set the following options for controlling how the watermark will be stamped in the converted document:


  • Text - watermark text
  • Font - watermark font name
  • Color - watermark color
  • Width - watermark width
  • Height - watermark height
  • Top - watermark top position
  • Left - watermark left position
  • RotationAngle - watermark rotation angle
  • Transparency - watermark transparency
  • Background - specifies that the watermark is stamped as background. If the value is true, the watermark is laid at the bottom. By default is false and the watermark is laid on top

To add a watermark, follow these steps:

  1. Create an instance of the Converter class and pass source document path as a constructor parameter
  2. Instantiate the appropriate ConvertOptions class e.g. (PdfConvertOptions, WordProcessingConvertOptions, SpreadsheetConvertOptions etc.)
  3. Create an instance of the WatermarkTextOptions class. Set appropriate properties to specify the watermark color, width, height, text, image etc.
  4. Set the Watermark property of the ConvertOptions instance with the instance of the WatermarkTextOptions class created in the previous step
  5. Call the Convert method of the Converter class instance and pass filename for the converted document and the instance of ConvertOptions from the previous step

The following code snippet shows how to apply watermark to the output document:

using (Converter converter = new Converter("sample.docx"))
    WatermarkOptions watermark = new WatermarkTextOptions("Sample watermark")
        Color = Color.Red,
        Width = 100,
        Height = 100,
        Background = true
    PdfConvertOptions options = new PdfConvertOptions
        Watermark = watermark
    converter.Convert("converted.pdf", options);