A watermark is a small text or image that is combined with the main content of the document. An image or text is often overlaid with transparency to soften it. By working with transparency, you can bring the watermark to the front. Low transparency gives the impression that the document content is passing through the watermark. Visually, this is similar to the effect that is created when the watermark is in the background.
For watermarks, you can customize the size, font, style, color, position on the page, specify the page numbers on which they will be displayed, etc., and also select an image from a PDF file as a watermark. Different types of watermarks can be used in one file. You can add multiple watermarks to each page of your document.