Convert EML to MSG Online

Updated: 2026-09-06

1) Upload EML file to convert

Drop files here, or Click to select

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Allowed file types: pst, ost, eml, msg, mime, smime, p7m, mbox, dbx, vcf, opf, asice, cpgz, lzh, zcf

2) Set converting EML to MSG options

3) Get converted file

DOWNLOAD CONVERTED FILE

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Various file naming and date saving options - organize your output files easily.

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How to convert EML to MSG?

💾 Upload Your File: Go to the site, click on «Upload File,» and select your EML file.

✍️ Set Conversion Options: Choose MSG as the output format and adjust any additional options if needed.

Convert and Download: Click 👉«Download Converted File»👈 to get your MSG file.

📖 Learn more: What is an EML file?

Cloud Based

Convert EML to MSG in your browser — no Outlook, Thunderbird, or mail client to install. Upload the file from any device and download the MSG in seconds.

Secure

Email files can hold private correspondence, headers, and attachments. Your EML upload is encrypted in transit with HTTPS/TLS and processed in data centers with multi-factor access control during the conversion to MSG.

Ease of Use

Converting from EML to MSG has never been so simple. Our intuitive interface lets you convert files in just a few clicks.

Privacy

The message body, headers, and attachments in your EML stay yours. After the conversion to MSG, both files are deleted automatically from our servers — never read, shared, or repurposed. Privacy Policy.

EML File

File extension	.EML
Category	Document File
Description	EML files are commonly used for email files generated in Outlook Express and other mail systems. EML emails are stored in standard MIME RFC 822 format. These files include the email headline and body in text ASCII format. Emails, attachments, and hyperlinks are all included when converting EML to PDF. Users can export EML files for archiving and storage and check for harmful code. EML files are compatible with Microsoft Entourage, Apple Mail, Thunderbird, IncrediMail, Outlook Express, and more.
Associated programs	CoolUtils Mail Viewer Apple Mail IncrediMail Microsoft Outlook Microsoft Windows Live Mail Mozilla Thunderbird
Developed by	Microsoft
MIME type
Useful links	More detailed information on EML files
Conversion type	EML to MSG

MSG File

File extension	.MSG
Category	Document File
Description	MSG file is a MS Outlook email saved to a separate file. Such mail format is also used in The Bat!, Windows Mail, MDaemon, etc. It contains email fields and attachments, supporting both plain text and HTML mail formatting. As a rule, the mail content is encoded by base64 scheme. Encoding is required for mail to pass the mail servers that originally process text only. MSG can be opened in the program version it was created in, and the file will conflict with all other applications. To convert .MSG to PDF, HTML, TXT or other formats use the online converter.
Associated programs	CoolUtils MSG Viewer
Developed by	Microsoft
MIME type
Useful links	MSG Formats More detailed information on MSG files

2026-02-11

Our legal team needed Thunderbird EML exports converted to MSG so they could load everything into Outlook for a discovery request. Processed 1,200 files overnight without issues.

Sandra Okonkwo

2026-04-03

Converted my personal EML archive to MSG when my company forced a switch to Outlook — all folder structure and sent dates came through correctly. Exactly what I needed.

Dmitri Volkov

2026-05-16

Had a backup of emails in EML from an old Thunderbird install and needed them in Outlook MSG for a new job's corporate environment. Batch conversion worked perfectly on all 500+ files.

Chloe Beaumont

Rating EML to MSG

4.7 (420 votes)Rate It

FAQ ▼

How do I convert EML to MSG?

Upload the EML file to CoolUtils' online converter, select MSG as the output format and click Convert. Download the MSG and open it in Outlook, or drag it into the folder where you want the message stored.

What is the difference between EML and MSG?

EML follows the internet mail standard and is written by clients such as Thunderbird and Apple Mail. MSG is the Microsoft format Outlook uses for a saved item. Both hold one message, but each client opens its own kind first.

Can I convert EML to MSG without Outlook installed?

Yes. CoolUtils' online converter builds the MSG file in the browser, so Outlook is not required on the machine doing the conversion. You need Outlook only on the computer where you finally open the message.

Does the conversion keep attachments?

Yes. Files attached to the EML are carried into the MSG, along with the sender, recipients, subject and date. Open the message in Outlook and the attachments are listed exactly as they were.

Is converting EML to MSG free?

Yes, the online conversion is free and there is no registration. Upload the EML, pick MSG and download the result. No mail client license and no installed software are involved.

Can I convert EML to MSG on a Mac?

Yes. The converter works in any modern browser, so a Mac can produce an MSG file even though Outlook for Mac handles saved items differently. Send the MSG on to a Windows colleague or import it later.

Quick answer: To convert EML to MSG, upload your EML message to CoolUtils' online converter, choose MSG as the output format, click Convert and download the file. MSG is the message format Outlook opens directly, so the mail keeps its sender, subject, date, body and attachments and can be dropped into an Outlook folder. Free, no installation.

EML is the plain standard file for a single email, saved by Thunderbird, Apple Mail, Windows Mail and many web clients. MSG is the equivalent file Outlook writes and reads. Converting EML to MSG lets a message from another client open in Outlook with its header fields and attachments in place.

How do I open an EML message in Outlook?

Outlook prefers its own MSG format, and older versions do not open EML at all. Convert the message to MSG first, then double click the file or drag it into a mail folder. The header fields and attachments come with it.