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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.

Here are the steps to follow:

• Create new instance of Converter class and pass source document path as a constructor parameter
• Instantiate the proper ConvertOptions class e.g. (PdfConvertOptions, WordProcessingConvertOptions, SpreadsheetConvertOptions etc.)
• Create new instance of WatermarkOptions class. Set needed properties to specify the watermark color, width, height, text, image etc.
• Set Watermark property of the ConvertOptions instance with the instance of WatermarkOptions class created in the previous step 
• Call convert method of Converter class instance and pass filename for the converted document and the instance of ConvertOptions from the previous step

Following code snippet shows how to apply watermark to the output document:

Converter converter = new Converter("sample.docx");
PdfConvertOptions options = new PdfConvertOptions();

WatermarkOptions watermark = new WatermarkOptions();
watermark.setText("Sample watermark");
watermark.setColor(Color.red);
watermark.setWidth(100);
watermark.setHeight(100);
watermark.setBackground(true);

options.setWatermark(watermark);

converter.convert("converted.pdf", options);