1. To delete all history in a chat:
Enter a chat window > tap "..." in the top right > select 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 on 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 Chat History
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.
