Try this software.
http://www.faststone.org/FSResizerDetail.htm
Text from webpage :
"FastStone Photo Resizer is an image converter / resizer intended to enable users to convert, rename, resize, crop, rotate, change color depth, add text and watermarks to images in a quick and easy batch mode. Drag and Drop mouse operation is well supported. "
but cannot do one time one shot....have to do one by one...is it true? or am i missing step?
FastStone Photo Resizer is a batch converter. You go to the directory where your files located and selected the all files that you wist to convert. Next select "Use advanced options" and the "Advanced Options" to select the necessary options including watermark selection. If you wish to rename the files, then make the changes under "Rename" option.
Click "Start" and the software will processes the files in the input list.