How to Convert EML to MHT: Complete Guide for Email Preservation

  Ashwani Tiwari
Written By Ashwani Tiwari
Anuraag Singh
Approved By Anuraag Singh
Modified On October 22nd, 2025
Reading Time 7 Min Read

Emails have become a vital means of communication, whether it’s in a professional field or in our personal lives. However, emails have their own file format, which is EML. But sometimes, users wanted to share the emails officially worldwide using a browser. So, they need to convert EML to MHT file format.

In this article, we’ll discuss how to transform EML file to MHT format without losing important data using both manual and automated solutions effectively. But first, we need to understand these formats.

What are EML and MHT Formats?

Before diving into solutions, it’s necessary to know about these formats and their functions. Let’s walk through it.

  • EML or Email Message file, which is popularly used by many email clients like MS Outlook, Thunderbird and many more, to save email conversations. It includes all data of the email, such as subject, date, body of email, etc. It’s widely used for migration & backup purposes too.
  • Whereas an MHT or MHTML web format saves emails, formatting, images, and other embedded items. Also, MHTML stores webpages in a single file, which can be viewed through any browser, such as Microsoft Edge, Mozilla Firefox or Chrome etc.

Therefore, when you need to view EML file in a browser, then transform EML file to MHT makes it easier to view without relying on any email client.

Why is There a Need to Convert EML to MHT?

There are several reasons given below for the conversion of .eml to .mht:

  • These.MHT files are ideal for storing content for the long term as they save their content in a single file with a structured format.
  • MHT format files are widely used in many organisations, whether it’s for communication, documentation, due to their reliability.
  • After exporting EML to MHT file, you can see your emails directly in the browser without using any email client.
  • It’s easy to share a single MHT file instead of sharing many EML files along with embedded images, attachments, etc.
  • MHTML files maintain the original data structure, including fonts, layout and other email formatting.

Effective Solutions to Transform EML File to MHT

There are multiple ways to convert EML to MHT format.

  • Using MS Outlook
  • Try Internet Explorer
  • Using Mozilla Thunderbird
  • Use MS Word
  • An Automated Tool

Let’s explore the most effective methods.

Method 1: Using Microsoft Outlook

MS Outlook provides an easy option for saving emails in MHT format. If you are already using Outlook as your default email client, this option could be time-saving and convenient.
Steps:

  1. Open Microsoft Outlook.
  2. Select the email folder, which is stored in an EML file.
  3. After selecting, right-click them and go to File > Save As.
  4. Choose MHT or MHTML file format.
  5. Browse your saving location, then click Save to convert EML to MHT process.
Pros:

  • It’s a safe and trusted method compared to others.
  • Effectively work with a few folders of EML files.
  • Also, preserves the original email data structure
Cons:

  • Very time-consuming process, as there is no batch conversion.
  • MS Outlook needs to be installed to do this conversion.

Read: How to Import EML Files to Outlook

Method 2: Using Internet Explorer

If you don’t have Outlook, you can use Internet Explorer to convert EML to MHT. Though this method is somewhat outdated, it is still useful for users with older versions or systems.
Steps:

  1. You can right-click the EML file to open it.
  2. Choose Open With > Internet Explorer.
  3. Once it opens, navigate to File > Save as.
  4. Select MHT single file format in Save As Type.
  5. Save the file in your desired location.
Pros:

  • No need to install any email client like Outlook.
  • Maintains all formatting and other embedded content structured.
Cons:

  • It’s Outdated, so it might not work in the new version system.
  • Not useful for batch conversion of .eml to .mht files.

Method 3: Using Mozilla Thunderbird with an Add-on

If you’re using Mozilla Thunderbird as your email client, then you can transform EML file to MHT file through an extension. Here is how you can do:
Steps:

  1. Open Thunderbird on your system.
  2. Import your EML files into a folder by drag & drop process.
  3. Choose the emails which you want to convert.
  4. Then, click on your selected emails & click Save As > File.
  5. Install the ImportExportTools NG add-on from the Thunderbird add-ons library.
  6. If your system has installed the ImportExportTools NG Add-on, then select MHT format.
  7. Browse your destination to save file again as an MHT file.
Pros:

  • Free, quick & open source tool
  • It can perform batch conversion of email files at once.
Cons:

  • Must need to install Thunderbird & add-ons on your pc.
  • Accuracy message formatting might differ among different emails.

Read Also: How to Convert EML to TXT

Method 4: Converting EML to MHT via Microsoft Word

Microsoft Word can also be used to convert EML files to MHT format.
Steps:

  1. Launch Microsoft Word on your PC.
  2. Navigate to File > Open & Search for eml file or folder.
  3. Wait for the load of the file.
  4. After loading, click on File > Save As, and choose .MHTML format.
  5. Press Save to store the email as an MHT file.
Pros:

  • Doesn’t need any email client like Thunderbird.
  • If working on single emails, then it’s best & easiest method.
Cons:

  • Your formatting or embedded attachments might get hampered.
  • Also, your attachments, like images, will be excluded.
  • This method is not suitable for bulk exporting.

As you can see, the above manual methods have many drawbacks. So, to avoid these challenges, users have to upgrade themselves by choosing an automated software. Let’s walk through it.

Smart Solution: Using an EML to MHT Converter

To get over from the drawbacks of manual processes, we recommend using the SysTools EML Converter Tool as the ideal option. This software offers bulk conversion of EML files to MHT with formatting and attachments intact. Also, provides an accuracy & reliability which saves time and effort. With its simple UI, a normal user can easily operate EML to MHT Converter without having technical knowledge.

 
Know more benefits of this proactive utility:

  • Along with MHT, it can convert EML to HTML, PST, MSG, MBOX, etc & many more.
  • Preserves your email data structure & integrity along with attachments.
  • Easy to operate, reliable, trusted, accurate & quick processing.
  • Easily batch conversion of .eml to .mht file without data loss.
  • Provides an option to preview your selected emails in a folder.

Step-by-Step Guide to Transform EML File to MHT

  1. Download & run the aforementioned dedicated software on your system.
  2. 1

  3. Tap on EML folder on your left, which contains your EML files.
  4. 2

  5. Click on Export option & choose Export EML files to MHT format.
  6. 3

  7. Apply advanced settings such as Naming Convention and Date Range Filter.
  8. 4

  9. Hit on Browse button to select the Destination Path to save the output file.
  10. 5

  11. Tap on Export button to convert EML to MHT format & finally tap on Ok button for successful conversion.
  12. 6

Conclusion

In this article, we’ve explained how to convert EML to MHT files effectively using many methods, whether it’s MS Outlook, Internet Explorer, Word or Thunderbird. However, using manual methods has some limitations, so users have to face challenges. So, for easy, quick, & reliable conversion of .eml to .mht file, we recommend using the advanced software mentioned above. As it’s a very trusted & automatic software, it makes our transformation process efficient by saving our time & effort.

  author

By Ashwani Tiwari

Being a Chief Technical Analyst, I am aware of the technicalities faced by the user while working with multiple technologies. So, through my blogs and articles, I love to help all the users who face various challenges while dealing with technology.