MapTiler Engine allows users to create their own watermark. This functionality is available in the MapTiler Engine PRO version. Creating a custom watermark is available in the Advanced options, which can be adjusted after the image is georeferenced. The watermark can be created either from an image or a text, a combination of both is currently not supported.
Image as a watermark
To create a watermark from an image, load the file in PNG format by clicking on the image file link. The watermark is randomly distributed on each of the 256x256 pix tiles. If you want to have your watermark aligned regularly in a grid, create a 256x256 pix image with a watermark inside. The size of 256x256 pix is the limit.