mbox splitter

(Average Rating 4.5 Based on 1156 Reviews)

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SysTools MBOX Splitter Tool

Best Software to Split MBOX File into Multiple Files in 5+ Ways

  • Split MBOX File into Multiple Small Files with All Mail Attachments
  • Offers 5+ Options to Split Large Size MBOX into Smaller MBOX Files
  • Split MBOX File by Size: Minimum 1MB & Maximum 20GB Size Supported
  • Allows to Split MBOX File According to Selected Date, Date Range, Year
  • Moreover, you can Divide MBOX Based on Sender and Subject Line.
  • Allows Intelligent Browsing MBOX File and Splitting into Smaller Files
  • MBOX Splitter Supports to Split MBOX, MBX, MBS File of All Origins
  • MBOX Splitter Supports All Latest and Earlier Version of Windows OS
  • SysTools Provides Both Offline (Desktop) and Online MBOX Splitter Tool

Free Live Demo - SysTools Offline and Online MBOX Splitter Tool Fully Secured to Use

Try Online MBOX Splitter new online

Awards & Reviews

MVP & Blogger Reviews

mbox splitter online support

Wide Variety of MBOX Compatible Applications

SysTools MBOX splitter wizard is highly advanced tool with integration of advantageous features. It is available as desktop utility and online MBOX splitter tool. It is also capable of supporting and breaking large MBOX files from more than 15 email clients such as:

  • Mozilla Thunderbird
  • Apple Mail
  • Eudora
  • PowerMail
  • Kmail
  • Netscape
  • Evolution
  • Spicebird
  • Google Vault Files(*.mbox)
  • Google Takeout(*.mbox)
  • Becky! Internet Mail
  • Claws Mail
  • Backupify
  • Postbox
  • Mulberry
  • Opera Mail
  • Horde Group Webmail
  • Entourage
  • SeaMonkey
  • Alpine

SysTools MBOX Splitter Tool - Video

MBOX Splitter Tool - Key Features

Split MBOX File into Smaller Files Either Offline or Online

split large mbox file

Split Large MBOX File

SysTools MBOX splitter tool enables user's to divide large MBOX files into small files. This way, users can use these small files to get better performance from MBOX related email clients. Try online MBOX splitter and easily split MBOX file by size in MB or GB.

support mbox online splitting

Add MBOX File or Folder

Users get the option to either add single/multiple MBOX file(s) or directly add an MBOX folder to the software interface. Therefore, instead of adding and processing MBOX files one-by-one, users can split MBOX in bulk. This makes the entire procedure hassle-free for users.

split large mbox file online

Split MBOX Based on Size

The utility offers users the option to divide their MBOX files/folders in specific size. You can make the resultant MBOX file anywhere from 1MB to 20GB in size. To do this, simply enter your desired size from the available range in its designated column and the software will break your large MBOX into smaller chunks in your preferred size.

Break By Year

Break MBOX File By Year

For easier bulk MBOX organization, users also get the option to split their MBOX files/folders according to years. This feature comes in handy when users wish to divide their large MBOX on an yearly basis. Moreover, users also get the option to split the MBOX in a certain year or one could also get their entire inbox divided on an yearly basis.

Divide MBOX by Date

Divide MBOX by Date

If you want to break down your MBOX files according to specific date/s, this utility provides you the option to do so as well. Enter the specific date in the designated column and the tool will provide you with an MBOX file containing email messages from that date only. This makes it easier for users to segregate their email messages date-wise for better organization.

by Date Range

Split MBOX by Date Range

Moreover, you can also divide your MBOX file according to the specific date range you want. Enter your preferred date range in the designated "Start" and "End" date columns and your resultant MBOX file will contain the emails transferred in the respective date range. This is another way you can organize your MBOX file(s) based on certain date ranges.

by Sender Address

Split MBOX by Sender Address

Another remarkable feature this tool offers is dividing an MBOX file based on sender's addresses. Thus, if you wish to segregate email messages from a specific sender, this tool will help you do so. Enter one or more sender's email addresses in the designated column (separate the addresses by commas) and the SysTools MBOX Splitter will break your MBOX file into smaller chunks accordingly. Moreover, you can also check the option for "All Senders" and the tool will provide you several resultant MBOX dedicated to each sender.

Split by Subject

Split MBOX File by Subject

If any user wishes to segregate specific email messages based on subject, they can do that easily with the help of the SysTools Split MBOX Utility. Enter your subject line in the respective column and the tool will provide you with smaller MBOX files containing all email messages with the entered subject line. This feature comes in use when one wishes to filter out emails based on a certain subject. You can also select the option to divide your MBOX based on all email subjects and you will get the resultant MBOX accordingly.

No Size Limitations

No Size Limitations

MBOX split tool is optimal enough to split large size MBOX file. There is no file size limit when splitting MBOX file. One can easily split a large number of MBOX files with no data loss and no bounding bars. The software offers the freedom to select emails from the folder and split all emails contained in the folder at the same time.

Preserves Email Properties

Preserves Email Properties

MBOX file splitter keeps all the email elements while splitting MBOX files by size. It manages emails, attachments, folders, HTML links, text formatting, sender and recipient information, subject, date, time, year, etc. So, even after splitting, you need to worry about your original content or the formatting of the MBOX file.

free online preview

Provides Free Preview of Emails

SysTools MBOX splitter tool provides preview of MBOX emails once you loaded in the software interface. One can preview email along with attachments like PDF, DOC, PNG, ZIP, etc. In addition, you can preview attachments in the attachment preview mode. This is the great way to check what emails are going to be split.

Standalone Application

Standalone Application

The software does not require the installation of an email application in order to split MBOX file. The user does not need to install or configure the Microsoft email client to divide large MBOX files. There are no application dependency issues associated with the tool.

support windows os

Windows OS Supportive

MBOX splitter tool is compatible with all the latest and previous editions of Windows including Windows 10, which is an excellent feature of this software. It can also be installed on all 32-bit and 64-bit Windows operating systems. So, you need to worry about what version of Windows is installed on your system.

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Fix Large MBOX File Issues

When MBOX is in large size, user face multiple problems and searching for the solution to fix it. SysTools MBOX splitter is capable to split MBOX file into individual message and fix all the issues faced by MBOX-supported email clients such as:

  • Thunderbird displays an error message due to large MBOX files.
  • Thunderbird mail client hangs for a long time and is therefore very time consuming.
  • Cannot access emails due to a large file size error.
  • Error stating that no valid mbox files were found.

MBOX Splitter Software - Specifications

Either Use Desktop Version or Online MBOX File Splitter

best mbox splitter

(Windows OS)

Name: SysTools MBOX Splitter
Version: 4.0
Size: 123.69 MB
Release Date: Mar, 2026
MD5: b29d4c64b326b0dfefb6120e9df10ecd
Delivery: Free via Email
Free Version: Download for Windows

(Mac OS)

SysTools Mac MBOX Splitter
4.0
29.13 MB
Mar, 2026
c3277da2bbc53dbc7ef468e799f4a012
Free via Email
Download for Mac

Trial Limitations:
(Windows)

The free MBOX splitter demo version will allow to split 50 mail per MBOX file.
(Mac)

The free Mac MBOX splitter demo version will allow to split 50 mail per MBOX file.
(Windows) (Mac)
Hard Disk Space: 100 MB of free hard disk space required 100 MB of free hard disk space required
RAM: 4 GB of RAM (4 GB is recommended) 4 GB of RAM (4 GB is recommended)
Processor: Intel® Core™ 2 Duo CPU E4600 @ 2.40GHz 2.39GHz Mac Computer with Intel Processor
Mac Computer with Apple Silicon (Apple M1)

Platforms:
(Windows)

 Windows 11, 10 (64 bit).
(Mac)

MacOS X 11.0 (Big Sur), MacOS X 12.0 (Monterey), MacOS X 13.0 (Ventura), MacOS X 14 (Sonoma), MacOS X 15.0 (Sequoia) and above versions.

Application Pre-Requisites:

(Windows)

  • Microsoft .NET framework 4.5 or above should be installed.

(Mac)

User Control

mbox splitter

FAQs

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MBOX Splitter Tool - Free vs Paid

Get an Overview of Split MBOX File Software Features - DEMO & Full Version

Features Free Version Full Version
Add MBOX File & Folder in Software Panel
Split MBOX by Size, Sender, Subject
Split MBOX by Date, Date-Range, Year
Supports MBOX from All Email Clients
Support Orphan MBOX files
No File Size Limitation
Preserves Original MBOX Data Integrity
Support Windows 11, 10 (64-bit)
Split MBOX File 25 Items / Folder All Items
Cost FREE Starting At $39
Frequently Asked Questions

Listed Commonly Asked Questions and Answers Regarding MBOX Splitter

Can I Split MBOX file from my hard drive?

MBOX Splitter screen

Yes, you only need to specify the exact location of MBOX file which you need to Split up.

Simple Steps to Split large MBOX file by size:
  • Step-1: Either Use Desktop Version or Online MBOX Splitter
  • Step-2: Click 'Add file' & Select 'MBOX' Files
  • Step-3: View Emails & Attachments Before Splitting MBOX
  • Step-4: Click on 'Export' Option to Save Splitted File
  • Step-5: Split MBOX File by Size and Save Locally

Yes, the software not only reduce the size of Mailbox but also move all the attachments along with emails.

No, MBOX Splitter does not impose any restriction on the size of files. The software have been successfully verified to run with 20 GB which will help to split MBOX File into individual messages.

Yes of course, the software facilitates you to Split your large sized MBOX file in the absence as well as presence of the email clients.
Yes, The MBOX splitter is compatible with all versions of Windows Operating System including Windows 11, 10, 8.1, 8, etc.
What Our Clients Say About Us

SysTools MBOX Splitter Software Verified Purchase Reviews

4.5
1156 Ratings
5 Star
70%
4 Star
20%
3 Star
3%
2 Star
2%
1 Star
5%