With DiffPDF, you can compare two .pdf files, textually or visually.
It offers three comparison modes: Words, Characters, and Appearance. 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 the first and 1-3, 5-13 for the second.
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