How to convert my group to supergroup?

To convert a normal group to a supergroup, do any of the following:

• Make the group public.
• Change group chat history visibility.
• Restrict a member.
• Change admin permissions or admin title.
• Activate 'Slow Mode'.
• Link group to a channel.
• Import group chat from other app.

The group will also become supergroup automatically when its members reach 196.


Note:
"The group was upgraded to a supergroup" notification won’t show on Plus Messenger v5.2 and newer.