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I'm on macOS Catalina 10.15.6 19G2021 x86_64.

I was trying to create a signature with Preview.app and the MacBook's built-in camera, when I clicked on Done button, the captured signature wasn't saved.

I tried to restart Preview.app, reopen the document and open another document and it still didn't work.

Is it a bug? What should I do? Thanks!

enter image description here

Preview.app version from "About Preview": Preview.app version from "About Preview"

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  • Did it show in the capture window before you clicked Done?
    – Tetsujin
    Sep 1, 2020 at 13:25
  • Have you tried restarting preview? Have you restarted your computer? Did you actually see a signature preview before you clicked done?
    – virus.cmd
    Sep 1, 2020 at 13:49
  • @Tetsujin Yes. The captured signature was shown in that window.
    – Teddy C
    Sep 1, 2020 at 14:03
  • @virus.cmd I tried to restart Preview.app, reopen the document and open another document and it still didn't work. I won't be restarting the computer now. And yes, I've seen the signature before clicking 'Done'. :)
    – Teddy C
    Sep 1, 2020 at 14:06
  • I guess I'll wait until the next time I restart my mac and try it again :)
    – Teddy C
    Sep 1, 2020 at 14:07

1 Answer 1

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You have to hold your signature ON the blue line, like that was a line on a page where you are signing.

The camera's view of your paper is mirror image. However, once Preview detects your signature, it will digitise it and display it correctly (non-mirror), and in a way that looks like you'd actually signed the screen (i.e. it's not just a picture of your paper).

In the image below you can see the digitised image in black, with my paper, with blue ink, somewhat obscured in the background: Signature detected

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