How to add water mask and limit photo weight and size for 100k photos?

Question

Adobe Photoshop

so that the water mask always occupies 10 percent of the photo in the corner, and the weight of the photo is corrected and reduced to the smallest possible, not at the expense of quality especially?
and automatic processing of 1000 photos processed)
who knows how to do it?

Answer 1

If it is difficult and more flexible, then the script is in Photoshop. If easier and faster, then for example, XnView MP