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I'm searching for something that would stamp a custom date on a PDF, like "Received\n$(date)".

I'm solely printing my stuff to stamp a date and then scanning them back... Haven't found anything yet.

The general trick I’ve found for things like this is the missing step is to first convert the PDF to image files, THEN watermark it with the dynamic date, then convert back to PDF.

Which is a pain in the ass to automate but effective.

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