Personalized signature, friends can read it or not, and non-friends can't read it. As long as you edit your signature on QQ, everyone can see it unless you don't write it.

But other information can be encrypted (such as gender, birthday, location, etc. ). If you want to hide them, you can set them in the following ways:

1. On the QQ panel, click "Open System Settings" at the bottom, a pinion icon;

2. In the "System Settings" window, click "Permission Settings";

3. Under the personal information on the right, click Permission Settings;

4. Pop up the setting window, and set the data to be hidden as "only visible to yourself".