When it comes to photo editing, it doesn’t get any better than
free–particularly if the tool has a reasonable amount of editing
tools. And that’s what XnView program has. You’ll be able to
resize, crop, correct red eye, flip, rotate, and perform a wide
variety of image adjustments, including for brightness, contrast,
and gamma. It will also convert your pictures among many different
image formats. It’s not a powerful photo tool like The GIMP, but for
most work, it’ll do just fine. And you can’t argue with free.