The validity period of the WeChat group QR code is only seven days, and users cannot set the validity period of the WeChat group QR code by themselves. In order to improve the user experience and avoid adding friends indiscriminately, WeChat officially set the validity period of the WeChat group QR code to 7 days.

After the number of people in each WeChat group reaches 100, users can't join the group chat through the QR code of WeChat group, but only by pulling WeChat friends into the group. The QR code of WeChat group will automatically expire after seven days, and it needs to be re-shared by the group owner and other personnel.

Extended data:

Functions of WeChat:

1, WeChat public platform: Through this platform, individuals and enterprises can create an official WeChat account, which can send text, pictures and audio content in groups. There are currently 2 million public accounts.

2. Friends circle: Users can post words and pictures through friends circle and share articles or music with friends circle through other software. Users can "comment" or "like" friends' new photos, and users can only view the comments or likes of the same friend.

3. WeChat Shake: It is a random dating application launched by WeChat. By shaking the phone or clicking the button to simulate shaking, we can match the WeChat users who trigger this function at the same time, thus increasing the interaction between users and the viscosity of WeChat.

Baidu Encyclopedia-WeChat