DiffPDF is used to compare two PDF files—textually or visually.

DiffPDF is a Windows GUI (graphical user interface) program for comparing two PDF files.
(If you require a command line tool use our comparepdfcmd application instead.)

Application: DiffPDF
The trial license key will be specific to this machine. (Download and install DiffPDF if you haven't already done so. Then run DiffPDF—the Register window will automatically appear. This window shows the Computer ID. If it doesn't match the one shown here (or if this one is empty), click the “Copy” icon beside the Computer ID to copy it to the clipboard, then paste it here.)

Note that only one trial per application per major version per machine is allowed.
Trial license keys are valid for 20 days.