Written by Jennifer Walsh. Reviewed for technical accuracy by Shubham Dixit, Independent Expert in Email Forensics and Data File Conversion.
Shubham is an independent external reviewer and not an employee of PCDOTS.
Quick answer. Google Takeout gives your Gmail as a single .mbox inside a .zip or .tgz, and Thunderbird reads MBOX with one free add-on. To import Google Takeout to Thunderbird, extract the archive, then use ImportExportTools NG to import the .mbox. It lands as one folder, since Gmail labels travel in headers, not as folders.
On this page
What Takeout gives you, and tgz vs zip?
First, know what you are holding. When you export Gmail from Google Takeout, your mail comes out as a single .mbox file, wrapped in an archive. Takeout lets you pick the archive as a .zip or a .tgz, and that is the only real difference between them, the same .mbox sits inside either one. A .zip opens with a double-click on Windows and Mac. A .tgz opens natively on Mac and Linux, and on Windows you just need a free unzipper like 7-Zip. So pick whichever you like, unpack it, and you are left with the .mbox that Thunderbird wants.
Zip or tgz, it does not matter, the same single .mbox comes out either way.
“This one is genuinely easy, and I wish more guides said so. Thunderbird already speaks MBOX, so a single free add-on, ImportExportTools NG, imports the file, that is the whole trick, not a stack of add-ons. The two things people trip on are the .tgz, which just needs 7-Zip on Windows, and the labels, because Takeout hands you one flat mailbox and Gmail’s labels live in the message headers, so everything lands in a single folder. If you truly need each label as its own folder, that is the one time a tool that splits the file earns its place.” Shubham Dixit, Email Migration reviewer (draft, pending approval)
The free way, one add-on
Here is the part some guides make sound harder than it is. You do not need a stack of add-ons, just one, and it is free. In Thunderbird, open the menu, go to Add-ons and Themes, search for ImportExportTools NG and install it. Then right-click Local Folders, choose ImportExportTools NG, then Import mbox file, and pick your extracted .mbox. That is it, the mail appears as a folder in Thunderbird. The whole thing takes a couple of minutes and costs nothing.
One free add-on imports the file, and it arrives as a single folder.
What to expect, one folder not labels?
One honest note so the result does not surprise you. Takeout exports your entire Gmail as a single flat .mbox, so it imports as one folder, not a tidy tree of your old labels. Your labels are not lost, they travel inside each message as X-Gmail-Labels headers, but a plain import does not rebuild them as separate Thunderbird folders. For most people, one searchable folder of all their mail is perfectly fine. If you specifically want each label back as its own folder, that is the job the tool below is actually for.
When a tool actually helps
To be straight with you, the free import above is all most people need, so do not pay for what Thunderbird already does. A tool earns its place in a few specific cases, when you want that one flat mailbox split back into folders by label, when the .mbox is very large and you would rather it be handled in one managed pass, or when you also want the mail in other formats. For those, the PCDOTS Google Takeout Converter reads the archive directly, previews it, and exports to Thunderbird on Windows, with a free version so you can test first. Use it for those cases, not for a basic import.
The tool route, for when you want the labels split back into folders.
Here are the tool steps with the screens.
Step 1. Install and run the software on Windows, then open the menu.
Step 2. Choose Google Takeout files from the Open menu.
Step 3. Browse and load your Takeout archive.
Step 4. Open Export and choose Thunderbird.
To get comfortable with the pieces, see our guides to import an MBOX into Thunderbird and, for another destination, import Google Takeout to iCloud. To peek inside the archive first, our free Google Takeout viewer opens it without importing.
The methods compared
Pick by what you need out the other side.
| Method | Best for | Good to know |
|---|---|---|
| ImportExportTools NG | A basic import, free | One add-on, lands as one folder |
| Takeout Converter tool | Split by label, large files | Windows, other formats too |
| Free viewer | Just reading the archive | No import needed |
Frequently asked questions
What format is Google Takeout mail in?
A single .mbox file inside a .zip or .tgz archive. Thunderbird reads MBOX, so once you extract it you are ready to import.
Should I choose tgz or zip in Takeout?
Either. The same .mbox is inside both. A .zip opens anywhere, and a .tgz opens natively on Mac and Linux or with 7-Zip on Windows.
How do I import the .mbox for free?
Install the ImportExportTools NG add-on in Thunderbird, right-click Local Folders, choose Import mbox file, and pick your extracted .mbox.
Do I need several add-ons?
No, just one. ImportExportTools NG is the only add-on required, and it is free. Any guide asking for a stack of them is overcomplicating it.
Why did my Gmail labels not become folders?
Takeout gives one flat mailbox, and labels travel inside the messages as X-Gmail-Labels headers. A plain import lands everything in one folder rather than rebuilding each label.
Can I split the mail back into folders by label?
Not with a plain import. That is the case where a tool that reads the .mbox and separates it by label into folders is worth using.
Just grab the add-on
There is no need to overthink this one. Export your mail from Takeout, unpack the .zip or .tgz, install ImportExportTools NG in Thunderbird, and import the .mbox, and in a couple of minutes your Gmail is sitting in Thunderbird for free. It will be one folder rather than your old labels, which is fine for most, and if you truly need the labels split out or the file is enormous, that is when the tool is worth a look. So go install that one add-on, point it at your .mbox, and you are done.
