First log in to WeChat and click on the "Me" interface. Click "Settings" to enter the setting interface.

In the setting interface, click "General" to enter the general interface.

In the common interface, click "Multilingual".

You can set the language of WeChat in the multilingual interface.

By the way, the font size can also be set generally. Click "Font Size" in the common interface, hold down the white button below and drag to adjust the font size.