1. To delete all history in a chat:
Enter a chat window > tap「...」in the top right >「Clear Chat History」.
2. To delete one single message:
Enter a chat window > long press the message > select「Delete」.
3. To delete multiple messages:
Long press one of the messages in your chat box > tap「Select」, select the message(s) you want to delete, and tap the trash icon below to delete.
4. To clear your history across all conversations:
Go to「Me」>「Settings」>「General」>「Clear All Chats」.
Note: In the interest of privacy, WeChat does not store your chat history on the server unless you explicitly use the backup feature. Your history cannot be recovered once deleted.