What is the QR code good for?

Scanning QR codes is a means for confirming contacts' identities. That way, man-in-the-middle attacks can be effectively prevented: If you receive a message of a confirmed contact (i.e., verification level 3), you can be sure that it wasn't spoofed or read by a third party (provided said contact's device wasn't stolen or hacked).

On top of that, scanning someone's QR code is a convenient way of adding them to your contact list without having to manually enter their ID.

Launch the QR-code scanner here:

  • Android: Side drawer > camera icon next to the QR code
  • iOS: Threema > My ID > camera icon in the top right corner
  • Windows Phone: Threema > “contacts” > QR-code icon in the toolbar at the bottom of the screen

If you are having trouble scanning a QR code, please make sure the camera is not too close (below 10 in/25 cm), which might prevent it from focussing.

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