One of the most frequent questions we’ve gotten so far is “How do I edit the subject line of a reply or forward?” It seems to be one of the best hidden features of the Gmail interface! Here’s how you do it:
- Start your reply or forwarded message.
- There will be an arrow at the top left of the address area, near your picture. Click that and you’ll get a menu that includes “Edit Subject.”

- Edit the subject line however you wish!