diff-pdf is a tool for visually comparing two PDFs. It takes two PDF files as arguments. By default, its only output is its return code, which is 0 if there are no differences and 1 if the two PDFs differ. If given the --pdf option, diff-pdf produces a PDF file with visually highlighted differences:
$ diff-pdf --output-diff=diff.pdf a.pdf b.pdf
Another option is to compare the two files visually in a simple GUI, using the --view argument:
$ diff-pdf --view a.pdf b.pdf
Packages are available for the following releases:
Ubuntu 16.10: 0.2-1~getdeb2~xenial
Ubuntu 16.04: 0.2-1~getdeb2~xenial
Ubuntu 14.04: 0.2-1~getdeb1
Ubuntu 17.04: 0.2-1~getdeb2~xenial
Ubuntu 14.10: 0.2-1~getdeb1
Ubuntu 15.10: 0.2-1~getdeb1
Ubuntu 15.04: 0.2-1~getdeb1

Package downloads per version:
Version 0.2: 1775

Install the application manually with the following commands:
sudo apt-get update && sudo apt-get install diff-pdf

Uninstall the application with the following command:
sudo apt-get remove diff-pdf

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