PDFDiff

PDFDiff is a command-line tool to compute the differences between two PDF files.

Installation

You need ImageMagick to use this tool.

To check if you have ImageMagick, run

which convert

or

which compare

Once you are certain that you have ImageMagick, run

gem install pdfdiff

to install PDFDiff.

Usage

pdfdiff first.pdf second.pdf result.pdf

This command might take a while to run. After it finishes, result.pdf will contain the diff of first.pdf and second.pdf, with their differences highlighted.