"Your software is the best I've ever used for comparing PDFs.", —customer feedback.
DiffPDF — compare PDF files quickly and easily: Click or drag one PDF; click or drag another PDF; click Compare. The changes are shown as if you'd used highlighter pens to show added, changed, or deleted text.This Windows application is our easiest to use and most affordable and popular product. Your PDFs are safely compared on your own computer without the size or page limits of online tools. Try free for 20 days or buy for $140 USD. (See also Why Compare PDFs?)
comparepdfcmd — compare PDF files. In a console (i.e., in a Command Prompt window opened by running cmd.exe) enter, e.g., comparepdfcmd.exe -r report.pdf old.pdf new.pdf and see any differences highlighted in report.pdf. Cloud-free: your PDFs are safely compared on your own computer without the size or page limits of online tools.
This commercial console (command line) program for Windows is ideal for more technical users doing testing, quality assurance, and scripted comparisons. Try free for 20 days or buy for $160 USD. (See also Why Compare PDFs?)
diffpdfc — compare PDF files in a console. This tool has been largely superceded by comparepdfcmd.
Some users prefer diffpdfc because they've integrated it into their workflow and don't want to change, or because they need a 32-bit application, or because they need pairs mode.
ComparePDF — compare PDF files.
This is an alternative to DiffPDF, but has proved far less popular, and so gets far fewer resources for its future development.
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