Water Marquee is a free tool that you can use to create a free, simple watermark. The directions are pretty easy to follow. Simply upload your photo (under 1MB), then decide where you'd like your watermark placed, whether you want a text or image for a watermark, what font you want to use, and what size/color you want it to be. Once your watermarked photo is finished, you can download it to your computer and upload it to your blog. From start to finish, watermarking an image on this site took me less than a couple of minutes. Couldn't be easier!
How do you watermark your photos? Do share! :)
Disclaimer: I received no compensation for writing this tip. I found it on my own and was so impressed by how easy it was I just knew I had to share it with you! :)