Also known as: 透かし, 水印
An image containing text or a Logo superimposed on top of the image, typically to identify the owner/creator of the work, prevent the image from being counterfeited and/or impede AI training. Some watermarks are also deliberately placed as a "paywall" on "samples" of "Paid Reward" images.
Posts with watermarks added by third-parties (anyone other than the artist) should not be uploaded.
Add Watermark Grid if it spans over a majority/the whole image. Add Too Many Watermarks if it is in excess so as to be noticeable from the thumbnail.