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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?

Community
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Tamara Wijsman
  • 57,881

3 Answers3

5

You want to use i‑net PDF content comparer.

enter image description here

John Goering
  • 449
Mehper C. Palavuzlar
  • 55,953
3

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.

MaoPU
  • 413
-1

My first answer would be to check the file size, or if you want something more exact, simply do an MD5 checksum verification (on mac, it's /sbin/md5 vi command line). For example if you have files a.pdf and a.newer.pdf, you can do this:

md5 -q a.pdf && md5 -q a.newer.pdf

which should return something like

e097902c53d9066aaf679037b6432bdb
920621db3765f6d580a498035b587f67

Even a small change will cause a huge hash difference.

r00fus
  • 250