I have some custom images on my site since they are technical images , someone can copy my site so I want to insert my sites name on every image like "www.mysite.com" , is there a bulk editing tool for this or should I make it with an image editor one by one.
Well, if it were me, I'd add a steganographed text to your images, as well as the url. But I don't know of anything that'll do all of them at once. It doesn't seem possible, since all the images would be different sizes.
Here's an example to get the idea: http://www.adobe.com/cfusion/exchange/index.cfm?event=extensionDetail&extid=1044198
There is http://www.coffeecup.com/pixconverter/ or http://www.photowatermark.com/ which is more expensive but much better. Those are 2 that I know of.