DiffPDF is used to compare two PDF files textually or visually.
Use DiffPDF to compare PDF files quickly and easily:
Click or drag one PDF; click or drag another PDF; click Compare.
DiffPDF is a commercial Windows graphical user interface (GUI) application ideal for office workers. (See also Why Compare PDFs?)
DiffPDF shows pairs of pages from the two PDFs being compared with any differences highlighted. Comparisons can be made based on the text regardless of layout, or based on appearance (which accounts for fonts, colors, layout, diagrams, images, etc.) DiffPDF is cloud-free: it runs on your own computer without the size or page limits of online tools—some customers compare PDFs with thousands of pages.
DiffPDF is useful for anyone who needs to compare PDF documents, reports, books, or labels—for example, archivists, engineers, journalists, packagers, publishers, researchers, software testers, and translators. DiffPDF is used in a wide range of contexts, from book authors to banks, insurance companies, and Government. (Screenshots.)
If you require a console-based command line tool, use comparepdfcmd.