watermark remover
Following up on "Wrong Whale,"
theinpaint.com is free and you can draw where you want to erase the water mark.
As for "Weary Walrus,"
pixlr.com is free but it is more of a photoshop than specifically a watermark remover.
But instead of using Pixlr, I am using www.photopea.com because
it has a lot more options, an easy to use interface, & in my opinion,
feels more similar to Adobe.
Have a good time! :)