How to Convert MBOX to MHT / MHTML Quickly and Securely?

  

Rollins Duke   
Published: September 8th, 2025 • 6 Min Read

You might know several file formats, including the MBOX or .mbox file format, short for Mailbox. It is the most popular and recognized file format for storing multiple emails in plain text. Further, this file format is supported by major desktop-based email clients, namely Thunderbird, Opera Mail, Apple Mail, Spicebird, and more. On the other hand, there are multiple instances where users want to access the email without the interface of the email client.

Hence, if you’re in the same queue, then you need to convert MBOX to MHT. For the same, you might be seeking the methods. In this article, we will unfold the best go-to practices to save the data of the MBOX file format to MHT without any error or risk.

Reasons to Convert MBOX to MHT

• MHT maintains the original email structure and attachments in a single file, which makes it easier to view the files without losing any data.
• MBOX stores multiple emails in one huge file, whereas MHT saves each email separately, which helps in better management.
• The files of MHT can be easily opened in web browsers. Therefore, they are more convenient to share without the need for an email client.
• Converting huge MBOX files into separate MHT files keeps them secure and safe, prevents them from damage, and also organizes them simply.
• MHT format is more suitable in case of storing the necessary and important emails, as it maintains and preserves formatting for the long term.

Manual Way to Convert MBOX to MHT

To convert MBOX to MHT, you need to follow these 3 stages. Follow the step-by-step guidance provided to you for saving the MBOX file to the MHT file:

Stage 1: Import MBOX to Thunderbird

1. Run the Mozilla Thunderbird application.
2. Move to Tool and then Add-Ons and Themes.
3. Now, find ImportExportTools NG and download it.
4. Right-click on the local folder and then choose ImportExportTools NG, and then import MBOX to Thunderbird.
5. Now select the import types.

Stage 2: Export MBOX in HTML

1. Open Mozilla Thunderbird on your device.
2. Choose the MBOX file folder that has emails, and then right-click on the folder and choose ImportExportTools NG, and then export all the messages in the HTML format.
3. Now, you have completely saved your files in individual HTML file formats.

Stage 3: Convert HTML to MHT format

1. Open an HTML file in a web browser and then open each HTML file in the browser.
2. Now, do Ctrl+S, and you can successfully save HTML into MHTML.

Drawbacks of Manual Ways 

• Converting MBOX to MHT is a time-consuming process, as you have to convert one by one.
• There can be a risk of data loss when you use manual methods.
• Handling hundreds and thousands of emails can be time-consuming and very confusing. Therefore, a manual way is not suitable for large files.
• Manual ways need technical knowledge. Therefore, it is not suitable for people who do not have technical knowledge.

Expert Solution to Convert MBOX to MHT

In this subsection, we will unfold the expert practices to convert the MBOX file format without the environment of any email client. For the same, experts recommend using  BitRecover MBOX Converter Tool; one of the intuitive and resilient software to export MBOX or .mbox file format into multiple different file formats for both Mac and Windows operating systems. Further, the unparalleled uniqueness of this tool includes preserving the emails with attachments including email text, images, and more. 

Most importantly, it is compatible with different email clients such as Gmail, Apple Mac Mail, Thunderbird, and more. Moreover, users can save MBOX to MHT along with other standard file formats. Besides this, this tool enables users to filter the email data using subject lines containing phrases or specific keywords, and data intervals. Now, let’s prevail to learn the steps of this robust software:-

1. Launch the aforementioned tool in your Windows or Mac operating system.
   
2. Now, click on “Select Files” and then, Next.
   
   
3. In the next pop-up window, choose the option for conversion while selecting the checkboxes > Next.
   
   
4. Choose the MHT file format from the “Select Saving Option” and find out the location of the resultant file using the “Destination Path” option.
   
   
5. With this, to convert MBOX to MHT, select “Convert”. 

Therefore, in a few steps, users can promptly convert the MBOX file. Also, this tool enables users to check the real-time update of the conversion of the data. And, once the process is completed, users can access the data in no time. Most importantly, there is no manual solution, therefore, using a professional tool is considered the optimal approach.

Features of the Expert Solution

• Bulk Processing Support: The converter optimizes the user’s work with a time-saving feature of bulk conversion in one go.
• Intact Data Integrity: This utility secures email data like metadata, formatting, attachments, and much more.
• Independent Utility: The converter works as an independent tool, as it doesn’t require any email client platforms for effective conversion.
• Preserves Folder Hierarchy: The tool keeps the originality and the structure of the MBOX files for easy access.
• File Naming Feature: It helps to manage the exported data with a customized name, like date, sender, and subject.

Conclusion

Overall, in this article, we have shed light on the reasons to convert MBOX to MHT / MHTML file extension. Since the accessibility of data using the MBOX file format is limited. Therefore, using the .mht file format allows users to access and transmit emails including images, text, video, and more. As there is no free solution to convert the .mbox file, hence, using the above-mentioned tool is among the one-stop solutions and the professional preferred choice.  It can prevent errors and quickly convert email data in different file formats.