Comparison of two pdf files

Question

I need to compare the contents of two almost similar files and highlight the dissimilar portions in the corresponding pdf file. Am using pdfbox. Please help me atleast with

Answer 1

If you prefer a tool with a GUI, you could try this one: diffpdf. It's by Mark Summerfield, and since it's written with Qt, it should be available (or should be buildable) on all platforms where Qt runs on.

Here's a screenshot: