DiffPDF is used to compare two PDF files—textually or visually,
is developed by Mark Summerfield, he said “In theory DiffPDF
could be built on Windows, but I haven’t managed to do it, so no
Windows executable is available. The problem is that I don’t
know how to build the Poppler library on Windows (apparently it
isn’t easy!).” and I did some effort to compile to on windows.
As I know it works on Windows XP and Windows 7 (both 32-bit and
64-bit Windows). DiffPDF can compare two PDF files. It offers
two comparison modes: Text and Appearance. By default the
comparison is of the text on each pair of pages, but comparing
the appearance of pages is also supported (for example, if a
diagram is changed or if a paragraph is reformatted). It is also
possible to compare particular pages or page ranges. For
example, if there are two versions of a PDF file, one with pages
1-12 and the other with pages 1-13 because of an extra page
having been added as page 4, they can be compared by specifying
two page ranges, 1-12 for t