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I've scanned about 100 documents, so I have a folder with 100 jpg images, but they are rotated by the angle up to 15 degrees. Is there any free simple to use software I can use to rotate them to the normal orientation? It would be good if it works on Windows XP or Windows 7.

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Imagemagick has a -deskew option which may be helpful and the app works very well from the command line on batches of files.

There's some handy Imagemagick scripts here - have a look at unrotate.

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Thank you. It decreases the angle of rotation of the image from 5-15 degrees (in my original images) to under 2 degrees (but doesn't eliminate it completely). – fiktor Oct 28 '10 at 10:16
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Maybe you want to see unpaper too.

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Pretty much any image manipulation package will allow you to rotate images. Paint.NET for example.

Actual deskewing where the image is distorted rather than just rotated is harder and is available in fewer packages.

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