We have covered 2 free online tools and 4 free software to add watermark to PDF in Windows 11/10. These are: Sejda is a free online tool to add a watermark to PDF files. Its free version lets you ...

If you work with PDFs in, you will at some point want to know how to add or remove a watermark in Acrobat. A watermark is an image or text added in front or behind the contents of a document.