I found this tool on a fellow bloggers site Real Estate Tomato
Have you ever needed to resize a picture but didn’t have any tools at hand and needed it done quickly? Use this site. With pixer.us you can edit your photos online using only your browser.
Upload your photo using the “load image” form. In a few seconds, the image will be displayed on screen and you can start to play with it.
After you’re done fixing your photo click on the “Save” button to download it using your preferred file format.
Now another easy tool is just to use the FREE Windows Power Toy to resize pictures. It doesn’t give you as many options but it loads on your machine and you don’t have to have internet access.
The Future of Real Estate Technology