On November 18, 2010, IÂ recommend diffpdf-an open source PDF compare software
On March 19, 2011, Diffpdf 1.1.4 Dev Test 1 released by Simeon
and Today, Mar 31 ,2011, New: Diffpdf Portable 1.1.4 (PDF file comparison) Released
Many thanks to
Mark Summerfield, he develops such a great software
Simeon, he made the portable version
btw, DiffPDF 1.1.5 Win32 version is also out, looking forward the portable version.
DiffPDF Portable Release News Screen shot