Add Watermark in PDF I would like to suggest you PDF Watermark Tool by which you can simply put your image, text, etc as watermark on your PDF files on a Windows PC without getting any error. Visit here to download this tool:- www.osttopstapp.com/pdf-watermark.html

I would like to suggest you PDF Watermark Tool by which you can simply put your image, text, etc as watermark on your PDF files on a Windows PC without getting any error.  

Long explanation: Most digital watermarks are visible, as they're not intended to be hidden. For example, an image watermark may be overlaid on top of the original image. Another common watermark is as a metadata for file formats that supports metadata attachment.