HTML Code way:

<img src="http://www.yourdomain.com/yourimage.gif" width="60" height="60">

Replace '60' with the size you want it and im sure you can guess the rest but that's the general code.

Or you can download free software called GIMP its an awesome tool at editing images and completely free, it may come in useful for other things too instead of just resizing images.

http://www.gimp.org/

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