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I've been using the Preview App to generate my passwords and to be able to sign virtually. But now what I want to do is to erase them completely, so that nobody can access them.

For example, if I sell my Mac in a hurry, or if someone accesses my Mac, I want to make it impossible to access those signatures.

I don't mean to press the X (cross) that appears after generating the signature; because I think that by pressing that, that signature must be saved somewhere. I don't know. What I'm saying is to eliminate it in a more strict way, forever.

Example sign

Is it possible to do this? How?

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  • If you're selling your Mac, why not just wipe the hard drive and be sure they're gone?
    – esqew
    Jun 22, 2020 at 22:14
  • Is that what I don't know, wiping the hard drive (which I guess is a factory reset) wipes the whole drive and there's no information left of anything? Jun 22, 2020 at 22:17

1 Answer 1

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Signatures are stored in a property list file at the following path:

~/Library/Containers/com.apple.Preview/Data/Library/Preferences/com.apple.Preview.signatures.plist

You can remove this file and empty your trash to be sure they're gone. Any security/assurance you need beyond this will require advanced techniques or a complete wipe of your hard drive.

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