I would appreciate if the developers could

Watermark Plus is an Easy-to-use app to protect your photo copyright. It supports all of popular photo formats even PDF file. I did review comments before I make purchase of it. It doesn’t trouble me much to position the watermark in batch processing, as I always resize my digital photos to the same resolution for a good view before I add watermarks. Photos in landscape or portrait, I would import them separately, just a little bit more work. Of course it takes time to organise photos downloaded over the internet, but what is the point to add watermarks if you don’t own the copyright.

Whatever, I would appreciate if the developers could add the auto detect photo dimensions feature.
One more thing, it supports adding PDF file, but you cannot save as PDF.

Alan5460256 about Watermark Plus