You have probably noticed that the pictures you receive in WhatsApp chats appear on your phones gallery & pict, gallery. On Android, a folder is created in the gallery by default, while on iOS, it saves to your camera roll.
Now, depending on who you are chatting with and what groups you are in – you really might not want some of that media to end up on your phone. Here’s how to turn that off:
iOS: Settings > Chats > Toggle off Save to Camera Roll.
Android: Settings > Chats > Toggle off Show Media in Gallery.