Looking for freeware to scan multiple photos and autocrop. Straightening would be a plus

1

NAPS2

NAPS2 is a great tool for just scanning images in. It's got a simple UI, a fair amount of customization, and a handful of basic editing features built in (one of which is an automated deskew).

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2

ScanTailor Advanced

ScanTailor Advanced (downloads are in the sidebar, labeled as "Releases") is a little more complex. It takes a folder of images and performs a series of steps to produce good book scans, though it might be useful for your purpose as well. The first step after importing images is to split them up, and ScanTailor does this by looking for straight lines that might indicate a gap between pages. Now, I don't know if this will handle any more than two pictures per image, but it will at least handle doubles. ScanTailor will also attempt to automatically deskew pictures, and then there are a few steps that you'll need to take to make your pictures come out nicely.

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