Best Software to Split MBOX File into Multiple Files in 5+ Ways
Free Live Demo - SysTools Offline and Online MBOX Splitter Tool Fully Secured to Use
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:
Split MBOX File into Smaller Files Either Offline or Online
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.
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.
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 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.
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.
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.
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 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.
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.
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.
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
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.
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.
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:
Either Use Desktop Version or Online MBOX File 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)
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(Mac) |
Product Guide: |
(Windows) |
(Mac) |
User Control

FAQs














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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 |
Listed Commonly Asked Questions and Answers Regarding MBOX Splitter
Yes, you only need to specify the exact location of MBOX file which you need to Split up.
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.
SysTools MBOX Splitter Software Verified Purchase Reviews