How to compare the contents of two PDF files? [duplicate]

Possible Duplicate:
How to compare the differences between two PDF files?

I'm currently summarizing a PDF of a Course I will need to do again next year,
it is possible that the contents of the PDF will change which would introduce mistakes in my summary.

Is there a way to view the changes between two versions of a PDF file?

Solution 1:

I have been using pdftotext of the xpdf toolbox before to export the content as plain text and compare it with my favourite diff tool. Right now I found pdfdiff, a python skript, which does exactly, what I did manually before. A quick test showed, that it does what it should.

So thanks for your question which made me look for a new, useful tool.

Edit:

I would suggest using it with meld, a great diff tool, which is supported by pdfdiff.

Solution 2:

You want to use i‑net PDF content comparer.