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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.

To add a watermark, follow these steps:

1. Create an instance of the Converter class and pass the 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 WatermarkOptions class. Set needed properties to specify the watermark color, width, height, text, image, etc.
4. Call the setWatermark method of the ConvertOptions instance with the instance of the WatermarkOptions class created in the previous step. 
5. Call the convert method of the Converter class instance and pass the filename of the converted document and the instance of ConvertOptions from the previous step.

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

const converter = new groupdocs.conversion.Converter('sample.docx')

const watermark = new groupdocs.conversion.WatermarkTextOptions("Sample watermark")
watermark.setColor("red")
watermark.setWidth(100)
watermark.setHeight(100)
watermark.setBackground(true)

const convertOptions = new groupdocs.conversion.PdfConvertOptions()
convertOptions.setWatermark(watermark)

converter.convert('converted.pdf', convertOptions)