You can use any image editor to place text over the image and mark it. There is also software that "watermarks" which blends the text into the image, so it can be seen, but doesn't obstruct like just plain text.

Home for the holidays, so I can't add an example right now. Come back Tuesday.

http://www.irfanview.com/

Includes Watermarking.

It takes a little to make the first one, but once you have a wartermark made, you can add it to all of your images, in an unobtrusive manner. You have to make a file that has your name or whatever as a gif or jpg image.

That's it! The software does the rest, including, position, how dark, and automatic addition to all files in one directory, or one file or whatever you want.

OK the software does about 100 other nice things as well, and It's Free Not a demo, not a cripple ware that goes bad in 30 days... 100% FREE!

http://www.irfanview.com/