Diff tool that allows saving the compare markup

Question

Is there a diff tool that allows saving of the compare markup?

To clarify, I would like to save the actual comparison of the two files that shows the differences to send to someone for review.

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EDIT

Lots of good answers here. In my case I already had a copy of Beyond Compare but didn't see the option. Thanks to John Saunders for pointing out the feature. It's "Session...Text Compare Report..." BTW.

My question was not specifically about Beyond Compare, so I am going to accept the answer that currently has the most up votes.

Answer 1

WinMerge is free and allows you to save the differences in various formats. It works well enough for me to not bother looking elsewhere, and I like the price.

There is also a portable version if you can't, or don't want to, install it.