Free Ways to Import MBOX File to Gmail

import mbox to gmail

November 4th, 2022 ~ File Management Tips ~ 5 Minutes Reading

Overview: This write-up will describe the methods to import MBOX to Gmail account with or without Thunderbird email client. Here you will get completely free methods with all information about the process.

We all know that MBOX file format is a widely used file format around the world to save your emails and other data. And on the other hand, Gmail is a web-based email service, which provides 15 GB of storage space for free to users.

This is the main reason users move data to Gmail accounts. But sometimes, users want to import MBOX files to Gmail accounts.

Maybe you are using Gmail and you received MBOX files. and you want to open MBOX file. Or before you are using an MBOX-supported email client like Thunderbird, Apple Mail, Entourage, etc, and not you want to move your data, etc.

Don’t worry, you will find the solution to all these problems here. Here we have mentioned some queries, that will help for better understanding.

Reasons Why Users Want to Upload MBOX Files to Gmail Account

“Hey, previously I used Thunderbird email client, but due to some reasons, I have to shut down it. And started using a Gmail account, but my all data are stored in MBOX format, which now I want to open in Gmail. But I don’t know the ideal methods to import MBOX to Gmail. Could anyone help me?”
“Hello there, I took a complete backup of my earlier Gmail account using Google takeout in MBOX format. Now I want to import Google takeout data to another Gmail account. I don’t know the right method, if possible, please suggest me the right method.”

To solve your all problems, the answers or methods are mentioned below with all preparations. Read the complete steps first and then apply them.

How to Import MBOX to Gmail with/without Thunderbird in Bulk?

Here I will mention the two methods to open and upload MBOX files in Gmail account. All the steps are mentioned below:

Method 1: Import MBOX Files to Gmail without Thunderbird

  1. Login to your Gmail account.
  2. And click on the “Gear” icon >> “See All Settings” option.
  3. And then, select the “Account and Import” tab and choose the “Import Mail and Contacts” option.
  4. Now a pop-up will appear and enter your account details like email address and password, which is connected to Thunderbird.
  5. Next, select the data that you want to import and hit the “Start Import” option.
  6. Lastly, hit the “OK” button to import MBOX to Gmail.


  • No filter option for unwanted emails.
  • If you want to import large data then this method will take a long time.
  • Users can’t import data from multiple Thunderbird accounts at once.

Method 2: Transfer MBOX to Gmail using Thunderbird

Preparations: Follow all the preparation first, and then follow the steps:

Preparation 1: If you don’t have the ImportExportTools NG extension installed, then open Thunderbird, click on the “Tools” icon >> “Add-ons and Themes” and then search the tool in the search box and add it to Thunderbird.

Add-ons and Themes

Preparation 2: As we all know, Google less secure apps not working. So now you have to access IMAP and generate an app password for safe configuration. The complete steps are mentioned below in detail.

app password

  1. Restart your Thunderbird email client.
  2. And then, select the “Tools” >> “Account Settings” option.
  3. Now, click on the “Add Mail Account” option to import MBOX to your G Suite/ Gmail account.
  4. After that, enter the login details like email address and generated app password rather than a normal password.

    login details

  5. And enter the server details >> Continue and >> Finish icon to import MBOX to Gmail account.

    import MBOX to Gmail account

Now that both accounts are connected and right-click on the folder of Thunderbird that you want to import. And then, choose “Move To” and select the Gmail account. Now successfully your MBOX files uploaded into your Thunderbird account.

folder of thunderbird

Limitations: Thunderbird email client is required in working condition.

Import Orphan MBOX Files to Gmail in Bulk

Sometimes, users received or got MBOX files, which are not connected to any client. and they want to import it. You can import orphan MBOX files to your Gmail account using the Thunderbird application. Open your Thunderbird account and right-click on any inbox folder (or where you want to import), choose the “ImportExportTools NG” option” >> “Import MBOX File” >> “Import Directly One or More MBOX Files” and lastly, select the file and open it.

Import MBOX file

Now you can, process the second manual methods to import MBOX to Gmail using Thunderbird. But if you don’t have an email client and you want to transfer orphan MBOX files to Gmail in bulk. then you should take the help of expert solutions.

Time to Say Goodbye

Above we describe the manual methods to import MBOX to Gmail account in bulk with or without Thunderbird. as always, manual methods have risks and limitations, so users can use these ways for certain data. but for large amounts of data, you should use expert or professional solutions.