You can send messages that disappear on WhatsApp by enabling disappearing messages. Once enabled, new messages sent in the individual or group chat will disappear after seven days. The most recent selection controls all messages in the chat. This setting won’t affect messages you previously sent or received in the chat. In an individual chat, either user can turn disappearing messages on or off. In a group chat, any group participants can turn disappearing messages on or off. However, a group admin can change group settings to allow only admins to turn disappearing messages on or off.
Note: Only use disappearing messages with trusted individuals. For example, it's possible for someone to:
By default, media you receive in WhatsApp will be automatically saved to your photos. If disappearing messages is turned on, media sent in the chat will disappear, but will be saved on the phone if auto-download is on. You can turn auto-download off in WhatsApp Settings > Storage and Data.