I tried using the Watermark tool in Acrobat Pro 2017. It won't let me choose a PNG file, which for obvious reasons is the format I use for watermarking.
My question is, with no apparent ability to load a PNG, how do I use this function?
You don't need to select a file with transparency. The watermark will automatically appear behind the contents of the page when you insert it, if you select that option under "Location".
I am trying to put a watermark over an image, so I would need to use a png for the watermark image to not have a white background. Is this possible with Acrobat DC? I need the overlaying image to be in the same location for multiple pages, which is why I was trying to add it as a watermark instead of a layer.
But what if your document background isn't solid white? This seems like a very surprising restriction, especially considering the purpose of a watermark.
Did you read my reply above? The one marked as Correct?
Agree, when you have a document background that isn't solid white (like a full bleed image), then setting the watermark to appear behind the document means you don't see it at all on those pages. Is there a way to use a PNG file or some other work around for documents that aren't just plain white?