Import EML Files into Thunderbird Safely and Quickly

Written By Shivam Rathore
Updated on January 5th, 2026

EML files are widely used for storing individual email messages and are supported by several email applications. They are useful when you need to backup, migrate, or maintain electronic mail messages for records. Mozilla Thunderbird is recognized as a popular, free, open-source email client and allows easy access to EML data, but the question is about the correct way. This blog explains ideal methods to open EML in Thunderbird for free or with a smart EML Converter Tool without risk and hassle.

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This is a user query found on a forum where the user is concerned about how to import EML files into Thunderbird appropriately.

Why Organizations Import EML Files to Mozilla Thunderbird?

Mozilla Thunderbird is considered an optimal email platform for opening and viewing EML messages as it offers various advantageous features. Some of them are mentioned below:

Organize, read, and manage EML files in a structured mailbox.
Maintain both online and offline accessibility to EML files.
Store all individual scattered EML files in a single space.
Preserve email headers, metadata, and attachments within the EML.
Maintain a backup for business and professionals to avoid data loss.
Use Thunderbird’s powerful extensions and add-ons for enhanced functionality and email personalization.
Create message groups, use fast search, tags, and benefit from design consistency and great flexibility.

Which Methods Safely Import EML Files into Thunderbird?

There are a few manual ways and an intelligent professional software that makes the EML to Thunderbird import a simplified task. This section explains all the methods in detail and also specifies the pros and cons of each method.

Generic Methods to Import EML to Thunderbird

We will discuss the drag and drop and the Thunderbird extension for the import of EML files. You can go through them here:

1) Open EML Files in Thunderbird Manually

Initially, start Mozilla Thunderbird and create a new folder within Local Folders.
After that, locate the EML files or folder on your system and select it.
Then, drag the EML files you need to access within Thunderbird.
Finally, drop them into the new folder of Thunderbird.

Note: You may also try this quick method to open individual EML→

Go to the More menu, click Open from File, and select Messages.
Browse the EML on your desktop/PC and press Open.

Why Choose?

Works offline, is simple and fast, and requires no additional software.

Why Not?

Unreliable for large EML batches and often loses the formatting and folder hierarchy.

2) Import EML Files into Thunderbird via ImportExport

First, start the Thunderbird application and click the More menu.
Then, press Add-ons and Themes and search ImportExportTools NG.
Click Add to Thunderbird and restart the application for changes to take effect.
Afterward, create a new folder or right-click on an existing folder.
Next, choose ImportExportTools >> Import EML Files >> Individual EML files.
Furthermore, select the relevant EMLs from the PC and click Open to upload them to Thunderbird.

Pros:

Suitable for a small volume of bulk imports, and doesn’t require any external application.

Cons:

Dependency on add-ons and requires compatibility with Thunderbird. Also, folder structure isn’t retained, and the chances of duplicates exist.

Advanced Method to Import EML Files to Mozilla Thunderbird

Users managing 100s, 1000s, or even more volumes of EML files require a strategic solution for their import. The EML Converter Tool is one such top-notch solution to handle bulk volumes of EML data with ease and precision. It accurately imports the files directly into Thunderbird in no time, maintaining the data fidelity and folder structure. Additionally, suitable for all technical and non-technical users, its user-friendly interface helps with a straightforward import on all Windows and Mac. Moreover, the advanced filter options and Demo Version availability give it an upper hand as compared to manual solutions.

Steps to Import EML Files into Thunderbird

Launch the EML File Converter Tool as an admin and tap Next.

Then, choose EML files or a folder and click Open to upload. Tap Next.

Further, preview the EML files and select them from the tree view. Click Next.

Afterward, choose Thunderbird from the file formats list and apply relevant filters.

Finally, select a Path to Save the resultant data in Thunderbird. (It is automatically redirected to your local Thunderbird profile, which you can change.) Tap Convert.

Client Testimonial:

I was so worried about securing my major EML files into Thunderbird account without losing data. However, using the EML File Converter Tool simplified my task, and I was able to export the entire set of EML files in a single go. The process was flawless, and all my data, including the folder hierarchy and metadata, was intact.

Conclusion

This blog defines all the necessary reasons to add EML files to the Thunderbird account. We discussed two easy, quick, and secure ways for the conversion. The manual method is suitable when you have a few emails to import. But with bulk volume of EML imports, using a professional tool is a smart choice. It enables you to import EML files into Thunderbird without hassle and saves your time, effort, and cost altogether.

Frequently Asked Questions

Q1. Can I import multiple EML files to Mozilla Thunderbird at once?

Ans. Yes, for multiple imports of EML files into Thunderbird, use the EML to Thunderbird Import Tool.

Q2. What is the safest way to import EML files into Thunderbird?

Ans. The safest way to import electronic mail files into a Thunderbird account is by using a dedicated conversion software.

Q3. How do I import EML to Thunderbird from external storage?

Ans. To import EML files to Thunderbird using an external storage:
Save your EMLs locally on the system from the external storage.
Use any manual method or professional software for the conversion.

Q4. Can I import EML files into Thunderbird offline?

Ans. Yes. For an offline import, use the EML File Conversion Software, which works on the system only. Or, you can use the Thunderbird application, but it is not suitable for bulk import of EML files.

About The Author:

Shivam Rathore

Meet Shivam, an experienced SEO executive and content strategist. He combines creativity with strategy to craft engaging content that connects with audiences and supports brand goals. With strong expertise in digital marketing and content planning, Shivam helps businesses thrive online.