Hello, the main reason why you need to scan your cell phone to log in to WeChat on the computer is for security reasons, which eliminates the security risks associated with password logging, such as:

Password logging is easy to steal, and hackers will use your WeChat to publish false information after stealing your account password; password logging is a good way for many people to memorize their passwords, and sometimes other people can log in to WeChat to see your chat records when they use your computer; cell phone scanning is an active logging behavior, which is equivalent to using your own cell phone for verification. The cell phone sweep belongs to the active login behavior, equivalent to their own initiative with the phone to do a verification, but also do not need to enter the password, simple and convenient;