Originally Posted by
noglider
Jon, if you are using Windows, please do yourself a favor and download irfanview and try it. If you can't figure it out, I'll connect to your computer remotely and help you.
For a couple of years now, the Preview app that comes on MacOS now lets you do simple things like rescaling images.
Unless they're GIANT files, you should be able to upload them to
http://imgur.com and then choose the image size from that site.