Mark your PDF as confidential, a draft or a copy, or put your logo on every page. See a live preview as you adjust it.
Yes. Enter the pages you want, such as 1-3, 5, or leave it empty for all pages.
Yes. Turn on "Repeat across the page" for a tiled pattern.
It is drawn onto the pages. For extra protection, run the result through Flatten PDF with "Whole pages to images".
No. Everything happens in your own browser, on your own device. Your files are never sent to a server, so nobody else can see or keep them.