The watermark can be removed from the PDF documents using third-party tools. However, if you want to remove a watermark that is almost impossible to remove, you can rasterize pdf documents. GroupDocs.Watermark provides the feature to convert all the pages of a PDF document to raster images with only one line of code....The watermark can be removed from the PDF documents using third-party tools. However, if you want to remove a watermark that is almost impossible to remove, you can rasterize pdf documents. GroupDocs.Watermark provides the feature to convert all the pages of a PDF document to raster images with only one line of code.