Use Terminal to delete your Messages App chat history permanentlyĪlso read: How to Copy, Cut, and Paste on a Mac How to clear iMessage transcripts.To prevent your Mac from storing your message history, update your Message App Preferences and untick the box for Save history when conversation are closed.To keep the conversation open but delete the content, choose Edit > Clear Transcript or Option+Command+K.Delete selections from message threads using a right-click and choosing Delete or Edit > Delete.Delete an entire conversation with Command + Delete or using File > Delete Conversation.
Eventually, simple text messages (SMS) evolved to incorporate images and audio (MMS).