Software that decreases resolution and renames multiple images all at once?

talk random
1

I’ve had a look around google and download.com but no luck :confused: I’ve found some that compresses but none that decreases the resolution. It needs to be freeware preferably since I’ll have to use this some time to come. But if its free to try I guess I could live with that till later.

I’ve got a little over 2000 images that needs to go from around 2000pixels+ to 500-700. So… :/.

Thanks!