These are older scanned documents that we have on file i.e. there's no possibility of re-scanning as the original documents are long gone.

Auto Straightener can detect skewed texts and images in scanned documents, and output a straightened version. This software allows you to straighten scanned image file and PDF file. The straightening is totally automated.

It is a handy tool for those who are working with scanned content regularly, allowing them to try to repair a file instead of striving to find the original document.