Quickly Export Thunderbird Emails to Gmail Without Losing Data

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  • Updated On:
    September 25th, 2025
  • Read Time:
    4 minutes

Summary: Are you looking for a solution to export Thunderbird emails to Gmail? Then, you are at the right place. In this write-up, discover the top methods to export your Thunderbird emails to a Gmail account. We’ve included manual techniques for tech-savvy users. And an automated professional tool, Thunderbird Backup Tool, for a quicker, more reliable migration. Read on to learn how to complete the transfer process successfully. But, before exploring the methods, let’s look into the reasons to carry out this export process.

Why Migrate Thunderbird to Gmail?

  • Gmail provides universal access, allowing users to check old messages even when they are away from their primary PC.
  • Many users are leaving desktop clients like Thunderbird behind in favor of Gmail’s cloud-based platform.
  • Large Thunderbird profiles take up gigabytes of storage; exporting them to Gmail clears that space.
  • With Gmail’s powerful search operators and labeling system, it is easier to find emails compared to Thunderbird.
  • Businesses moving to Google Workspace need to bring their Thunderbird email history along.

Different Approaches to Export Thunderbird Emails to Gmail

Manually Migrate Mozilla Thunderbird to Gmail

This approach uses the IMAP protocol to sync emails from both Thunderbird and Gmail. It also ensures that the original folder structure is maintained.

The following are the steps to begin the process:

Step 1: Enable IMAP in Gmail Account

  1. First, open Gmail and log in with your Gmail account credentials.
  2. After that, head to Settings > See all Settings > Forwarding and POP/IMAP tab.
  3. Then, under the IMAP Access, Enable IMAP

Step 2: Add a Gmail Account to Thunderbird

  1. Open Thunderbird and then go to Account Settings > Account Actions > Add Mail Account.
  2. Next, enter the Gmail account credentials and select IMAP.
  3. After the emails appear in Thunderbird, select the email messages you want to export to Gmail.
  4. Then, drag and drop them into the Gmail folder.

Limitations: Some messages or attachments may not upload correctly due to size restrictions or server timeouts. Occasionally, Thunderbird may skip certain emails or attachments because of server limits. Some emails or attachments may not upload due to size constraints or server interruptions. 

Transfer Thunderbird Emails to Gmail by Forwarding Method

Forwarding emails is a simple manual way to get Thunderbird messages into Gmail. You can forward individual messages or batches of messages to your Gmail account. 

These are the manual steps to initiate the export process:

  1. Launch Thunderbird and open the folder containing the desired email messages.
  2. Now, select one or more messages you wish to forward. 
  3. Then, right-click the selected emails and choose Forward As > Inline/Attachments.
  4. In the recipient field, add the Gmail address where you want to forward the emails.
  5. After that, hit Send.

Limitations: Manually forwarding hundreds or thousands of emails can be extremely time-consuming. Forwarded emails do not retain Thunderbird’s folder organization; they appear in the inbox or a label chosen in Gmail. Inline forwarding removes headers; attachments preserve them but are less readable.

A Professional Way to Export Thunderbird Emails to Gmail

The Thunderbird Backup Tool is a comprehensive solution to migrate or archive Thunderbird emails efficiently. It supports backup into 12+ file formats such as PST, PDF, MBOX, etc. Users can export local folders and attachments filtered by date. The tool gives options to convert attachments to PDF, split large PST files, and migrate directly to email clients. This tool simplifies the process for professionals and teams. 

The following are the steps to migrate Thunderbird to Gmail:

  1. Download, install, and run the tool.
  2. Then, choose the Thunderbird account profile.
  3. Pick the mailbox from the mail list and click on Next to continue.
  4. Now, under Saves/Backup/Migrate As, choose Gmail as the saving format. 
  5. Authenticate it with the Gmail account credentials.
  6. Apply the additional features if needed.
  7. Finally, click on the Convert button.

Conclusion

Exporting Thunderbird to the Gmail email client ensures improved accessibility and better compatibility. In this blog, we have explored multiple manual solutions using IMAP synchronization and the Forward method. Whereas, for faster, more precise, and error-free results, choose a dedicated Thunderbird Backup Tool to export Thunderbird emails to Gmail.

Frequently Asked Questions

Q- How do I set up Gmail in Thunderbird for email migration?

Ans- You can add your Gmail account to Thunderbird using IMAP settings. This allows you to drag and drop emails from Thunderbird folders to Gmail folders.

Q- Can I export Thunderbird emails to Gmail with attachments?

Ans- Yes, using IMAP or specialized migration tools, emails along with attachments can be transferred safely. Manual forwarding also works, but can be cumbersome for large volumes.

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About The Author:

Sachin Prajapati is an experienced technical content writer with a passion for simplifying complex topics. Specializing in email and cloud migration solutions, he crafts informative and reader-friendly content that empowers users to understand and manage their digital tools more effectively. His insights have been featured on several respected tech platforms, earning the trust of a wide audience.

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