[OS X TeX] OT: Tool for Comparing PDF files ?

[Steffen Wolfrum]

Hi,
apologies for this slightly OT-question:

Does someone know a tool for comparing PDF documents?

Now and then I make small changes in the source files and would feel saver if I'd had a tool that would show me when a resulting PDF has / has not differences (to a PDF that was made before I made the changes) …

Steffen

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