How to Change the Subject Line in Gmail: A Step-by-Step Guide


Michael Collins

Changing the subject line in Gmail might seem like a no-brainer, but it’s not as straightforward as you might think. Whether you’re trying to organize your inbox better, make your emails stand out, or correct a typo, changing the subject line can be a handy skill. So, how do you do it? Simply open the email, click on the "Reply" button, and then click on the "Edit Subject" option. From there, you can type in your new subject line and hit send. Easy-peasy, right? Let’s dive into the details.

Step by Step Tutorial: Changing the Subject Line in Gmail

Before we get into the nitty-gritty, let’s understand why you might want to change an email’s subject line. Maybe you’re replying to a thread but want to highlight a new topic, or perhaps the original subject line had an error. Whatever the reason, here’s how to make that change.

Step 1: Open the Email

First things first, open the Gmail message you want to edit.

Once you’ve found the email, simply click on it to open the conversation thread.

Step 2: Click on ‘Reply’

Now, you’ll want to initiate a reply by clicking the "Reply" button.

The "Reply" button is usually located on the top right corner of the email window. If you’re on mobile, it might be at the bottom.

Step 3: Click on ‘Edit Subject’

After clicking "Reply," look for the "Edit Subject" option.

The "Edit Subject" option might be hidden in a small drop-down menu, represented by three dots or an arrow.

Step 4: Change the Subject

Now you can change the subject line to whatever you want.

Be sure to keep it relevant and concise to help the recipient understand the email’s contents at a glance.

Step 5: Hit Send

Lastly, once you’re happy with the new subject line, hit "Send."

Remember, this will start a new email thread, so use this feature sparingly to avoid confusion.

After you’ve sent the email with the new subject line, it will appear as a separate conversation in your recipient’s inbox. This can be particularly useful if you’re discussing multiple topics with the same person, as it helps keep conversations organized and focused.

Tips for Changing the Subject Line in Gmail

  • Keep the new subject line relevant to the content of the email.
  • Don’t change the subject line too often in a single conversation as it can confuse the recipient.
  • Use this feature when diverting to a new topic in an ongoing conversation.
  • Keep it short and sweet; long subject lines can be overwhelming.
  • Use keywords that make it easy to search for the email later.

Frequently Asked Questions

Will changing the subject line create a new email thread?

Yes, changing the subject line will create a new email thread separate from the original conversation.

Can I change the subject line when forwarding an email?

Yes, you can change the subject line when forwarding an email by following the same steps.

Can I change the subject line on the Gmail mobile app?

Yes, the steps are similar on the Gmail mobile app, though the buttons may be located in different places.

Is it possible to change the subject line of a sent email?

No, once an email has been sent, the subject line cannot be changed. You would need to start a new email.

Will changing the subject line notify the other participants in the thread?

No, changing the subject line will not send a notification, but it will start a new thread that the recipients can see.


  1. Open the email you want to change.
  2. Click on ‘Reply.’
  3. Click on ‘Edit Subject.’
  4. Enter your new subject line.
  5. Hit ‘Send.’


Changing the subject line in Gmail is a simple yet powerful tool that can make email communication more effective. Whether you’re trying to stay organized, highlight a crucial aspect of your message, or correct a previous mistake, it’s an easy process that can make a big difference. Remember to use this feature wisely to avoid creating unnecessary confusion in email threads. Now that you’ve mastered how to change the subject line in Gmail, your email game just got a bit stronger. Go ahead, give it a try, and see how it transforms your inbox management.