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

Changing the subject line in Gmail is a simple process that involves opening the email you wish to edit, clicking on the “More” button, and selecting “Edit subject.” From there, you can type in your new subject line and hit “Send” to save the changes.

After you complete the action, the email will display the new subject line in your inbox and the recipient’s inbox. Any subsequent replies to the email will also carry the updated subject line, making the conversation easier to track and reference.


We’ve all been there – you send an email, only to realize seconds later that the subject line is either misleading or downright irrelevant. Or maybe you’re in an ongoing email thread, and the topic has shifted so far from the original subject line that it’s become confusing. It’s not just about keeping your inbox tidy; it’s about communication efficiency. In professional settings, where dozens of emails are exchanged daily, a clear and relevant subject line can be the difference between a prompt response and your message getting lost in the shuffle.

Changing the subject line in Gmail is a feature many users aren’t aware of, but it’s a game-changer for maintaining seamless communication. Whether you’re a busy professional, a student coordinating group projects, or just someone who likes to keep their digital life organized, mastering this simple trick can save you time and avoid confusion.

Step by Step Tutorial on How to Change the Subject Line in Gmail

Before we dive into the steps, it’s important to note that this tutorial will help you keep your email threads relevant and on-topic by changing the subject line mid-conversation.

Step 1: Open the Email

Open the email for which you want to change the subject line.

Once the email is open, you’ll see the current subject line at the top of the message. Remember, you can only change the subject line for emails you’re sending, not the ones you’re receiving.

Step 2: Click on “More”

Click on the “More” button, usually represented by three vertical dots on the top-right corner of the email window.

The “More” button reveals a dropdown menu that contains several options to manage your email.

Step 3: Select “Edit Subject”

In the dropdown menu, select the “Edit Subject” option.

This will open a new compose window where the subject line is now editable.

Step 4: Type in the New Subject Line

Delete the old subject line and type in your new, relevant subject.

Be concise and clear with your new subject line to ensure it accurately reflects the email’s content.

Step 5: Hit “Send”

After typing in the new subject line, click “Send” to save the changes and continue the email thread.

By hitting “Send,” you’re not only changing the subject line but also sending the updated conversation to the recipients.


Improved OrganizationBy updating subject lines, you create a more organized inbox, making it easier to find and manage emails.
Enhanced Communication ClarityA relevant subject line ensures that recipients understand the context of the email before opening it, improving communication efficiency.
Better Email Thread TrackingChanging subject lines in ongoing conversations helps keep track of the discussion’s evolution, especially in lengthy email threads.


Possible ConfusionIf not all recipients notice the subject line change, it can lead to confusion or missed emails.
Limited to Sent EmailsYou cannot change the subject line of received emails, which limits the organization to the conversations you initiate.
May Trigger Spam FiltersFrequent changes to subject lines may sometimes trigger spam filters, landing your emails in the junk folder.

Additional Information

When changing the subject line in Gmail, it’s essential to consider the context of the conversation and the recipients’ expectations. For instance, if you’re in a professional setting, keep the subject line formal and to the point. In contrast, if it’s a casual conversation, you can be more creative or personal with your subject line.

It’s also worth noting that while you can change the subject line for individual emails within a thread, it may be more practical to start a new thread if the topic has completely changed. Lastly, remember that changing the subject line can help you create email filters and rules, making inbox management even more streamlined.


  1. Open the email you want to edit.
  2. Click on the “More” button.
  3. Select “Edit Subject” from the dropdown menu.
  4. Type in the new subject line.
  5. Hit “Send” to save changes and update the conversation.

Frequently Asked Questions

Can I change the subject line of an email I’ve already sent?

No, once an email is sent, the subject line cannot be changed.

Will changing the subject line start a new email thread?

No, it will continue the existing email thread but with the updated subject line.

Can recipients see the previous subject line after I change it?

No, once changed, the new subject line replaces the old one, and recipients will only see the updated version.

Is it possible to change the subject line in the Gmail mobile app?

Yes, the process is similar to the desktop version, but the layout may differ slightly.

Does changing the subject line affect the email’s delivery?

No, it doesn’t affect the delivery, but excessive changes could potentially trigger spam filters.


In the world of constant digital communication, knowing how to change the subject line in Gmail is an underrated skill that can significantly enhance your emailing efficiency. It’s not just about correcting typos or updating a subject; it’s about ensuring that your communication is clear, organized, and easily traceable.

As long as you keep the potential drawbacks in mind and use this feature judiciously, you’ll find it to be a valuable addition to your email management toolkit. Now that you know how to do it, go ahead and give your email threads the clarity they deserve!

Get Our Free Newsletter

How-to guides and tech deals

You may opt out at any time.
Read our Privacy Policy