DiffPDF is a Windows graphical user interface (GUI) application for comparing two PDF files. 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 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.

Optimizations have been applied to the Standard text comparison algorithm which produce noticable speedups in many cases. (The most important optimizations are only available in 64-bit editions. These editions can run more than 10% faster depending on the PDFs being compared at the expense of using more memory.)

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