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Preview can't digitally sign PDFs. I have to do this on a near daily basis.

EDIT: I mean sign with a certificate, not add an image. Personally I would prefer to not have any adobe software on my mac.

discuss

sqs|5 years ago

By "digitally sign", do you mean insert a picture of your handwritten signature? It can do that: https://www.macrumors.com/how-to/digitally-sign-a-pdf-using-.... If you mean cryptographically sign, then disregard my comment.

hunter2_|5 years ago

This lack of differentiation really grinds my gears. Why in the world do both of these activities share a name? It would be really interesting to take a random sample of the population and ask them some basic context like their occupation/education, and ask them whether a digital signature comprises a graphic of handwriting (validated with eyeballs) or something more sophisticated (validated with math).

There will be some obvious trends, but I suspect there will also be some surprises.

freefriedrice|5 years ago

Yeah, the latter: keychain certificate (under "Certificates").

darwingr|5 years ago

Just dealt with this yesterday. It’s too bad because I really like the signatures I have saved under Preview.

So I sign all signatures on a lease with Preview except for the very last one, which I did using a digital signature under Adobe Reader. it was a self-signed one certificate but the goal is still to have the other person feel comfortable with doing a contract over email than in person anyways.

toomuchtodo|5 years ago

Could you use JSignPDF instead?

https://github.com/kwart/jsignpdf

monadic2|5 years ago

What’s the benefit of signing the pdf itself rather than the distribution? If there’s a large need for this seems like an easy way to make a bit of money cutting out adobe.