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Free MBOX Converter
Convert to Any Format

Convert MBOX, MBX, and MBS files to EML, EMLX, MSG, PST, PDF, CSV, HTML, TXT, or JSON. Supports Thunderbird, Gmail Takeout, Yahoo, Apple Mail, and more.

9 output formatsBatch file supportThunderbird & Gmail compatibleInstant conversion

Drop MBOX files here

or click to browse · select multiple files

Overview

What Is MBOX to EML Conversion?

MBOX to EML conversion turns a single MBOX file (which holds many email messages) into multiple EML files — one per message. MBOX is used by Mozilla Thunderbird, Apple Mail, and Google Takeout. EML is a standard single-message format (RFC 5322) that Outlook, Windows Mail, and most email clients can open. Converting to EML lets you move mail from Thunderbird or Gmail into Outlook, or archive each email as its own file.

Our free MBOX to EML converter processes on your device. You drop an .mbox file, and the tool splits it on the standard "From " separator, parses headers and body (including base64 and quoted-printable), and generates one .eml file per message. You can download all EML files in one go. All processing happens on your device; nothing is uploaded.

EML is universal: the same .eml file can be opened in Outlook on Windows, Mail on Mac, Thunderbird, or web-based tools. Use cases include migrating from Thunderbird to Outlook, backing up Gmail Takeout as individual EML files, and feeding messages into archiving or legal hold systems that expect one file per email.

Features

Features

Why use our MBOX to EML converter

One EML per message

Each email in your MBOX becomes a separate .eml file, ready to open in Outlook, Windows Mail, or any EML-compatible client.

Download all at once

Convert and download all EML files in sequence with a single action — no need to save each message manually.

No upload

MBOX is parsed and converted entirely on your device. Your emails never leave your device.

Private & secure

Your mailbox file is processed privately. No data sharing — ideal for personal and work email conversion.

Preview before convert

See email count and a preview of the first messages before converting to EML.

Universal EML support

EML is supported by Outlook, Windows Mail, Thunderbird, Apple Mail, and most email clients worldwide.

How it works

How to Convert MBOX to EML

Four steps — no install, no sign-up

01
01

Open the MBOX to EML Converter

This page opens with EML already selected as the output format.

02
02

Drop your .mbox file

Drag and drop an MBOX file (e.g. from Thunderbird or Gmail Takeout), or click to browse.

03
03

Review the preview

Check the email count and preview table. Each message will become one .eml file.

04
04

Convert & download all EML

Click Convert & Download. Each email is saved as a separate .eml file in sequence.

Use Cases

Use Cases

When to convert MBOX to EML

Thunderbird to Outlook

Move mail from Thunderbird (MBOX) to Outlook by converting to EML and importing the .eml files.

Gmail Takeout to EML

Export Gmail via Takeout as MBOX, then convert to EML for use in other clients or backup.

One file per message

Archive or process each email individually; many systems expect one .eml per message.

FAQ

Frequently Asked Questions

Common questions about MBOX to EML conversion

Q1. What is MBOX to EML conversion?
MBOX stores many emails in one file; EML stores one email per file. Converting MBOX to EML splits the mailbox so each message becomes its own .eml file, which you can open in Outlook, Windows Mail, or other clients.
Q2. Why convert MBOX to EML?
EML is a universal single-message format. Converting lets you import emails into Outlook, archive messages individually, or use them in any app that supports .eml files.
Q3. Is EML universal?
Yes. EML (and .eml files) are based on the same standard as MBOX (RFC 5322). Outlook, Windows Mail, Thunderbird, Apple Mail, and most email software can open .eml files.
Q4. Do you upload my MBOX file?
No. Conversion runs entirely on your device. Your file is read, parsed, and converted on your device. Nothing is sent to our servers.
Q5. Can I convert Gmail Takeout MBOX to EML?
Yes. Google Takeout exports mail as MBOX. Use this tool to convert those files to EML for use in Outlook or other email clients.
Q6. Why do I get multiple EML files?
Each message in the MBOX becomes one EML file. Download All triggers a separate download for each so you can import them into Outlook or any client that uses one .eml per message.
Q7. Does it work with Thunderbird and Apple Mail MBOX?
Yes. MBOX from Mozilla Thunderbird, Apple Mail, and Gmail Takeout are all supported. The tool detects messages by the standard MBOX separator.
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