rcirr wrote:
I use FastStone Photo Re-sizer for water marking. It's free for non-commercial use. You have to register for commercial use so I assume there is some charge for that. It's easy to use and also does a lot more than just watermark. It re-sizes, does basic editing and can add text, borders, etc.
I agree with FastStone, both Photo Resizer and Imager Viewer are excellent tools, and both are free, you can make a donation if you find it is worth something to you.