A SysTools MBOX Converter alternative that runs in your browser
SysTools MBOX Converter is a capable Windows desktop application — but if you just want to open, read and search an .mbox file, you don't need to install anything. Drop the file into the box below: it is parsed locally in your browser, on any operating system, and your file never leaves your device.
Drag & drop your .mbox file here
or
Your file never leaves your device — everything is parsed locally in your browser.
Messages
License active ✓| # | Date | From | Subject | Size | Att. |
|---|
Message
- From
- To
- Cc
- Date
Attachments
MBoxConvert vs. SysTools MBOX Converter
Facts about SysTools MBOX Converter are from its official product page on systoolsgroup.com, checked September 2026.
| MBoxConvert (this site) | SysTools MBOX Converter | |
|---|---|---|
| Type | Web tool — runs in a browser tab | Desktop application you download and install |
| Platform | Any OS with a modern browser — Windows, macOS, Linux, ChromeOS | Windows 11 / 10 / 8.1 / 8 / 7 (a separate Mac edition is sold) |
| Price model | Free viewer, search and CSV export; $9.99 one-time unlocks the merged PDF export | Free demo exports 25 items per folder; full license $39 one-time |
| Privacy | File is parsed locally in your browser and never uploaded — verifiable in the Network tab | Files are processed locally on your PC by the installed application |
| Large files | Streams the file in 2 MB chunks — multi-GB Gmail Takeout exports open fine | Built for batch conversion; offers file/folder modes for many files at once |
| Output formats | Read & search in place, CSV metadata (free), one merged PDF ($9.99) | PST, EML, MSG, PDF, NSF, HTML |
When SysTools is the better choice
You need PST, EML, MSG, NSF or HTML output
If the goal is importing the mailbox into Outlook (PST) or IBM Notes (NSF), or producing per-message EML/MSG files, that's what desktop converters are for — this site only exports CSV and PDF.
You're batch-converting many files
SysTools' folder mode, output splitting and file-naming options are built for repetitive, high-volume conversion jobs on a dedicated machine.
Your organization requires installed software
Some IT policies mandate a vetted desktop application with vendor support instead of a web tool — a legitimate reason to pick SysTools.
When this site is the better choice
You just want to look inside the file
Reading, searching and downloading attachments from a Gmail Takeout or Thunderbird export is free and instant here — no $39 license, no installer, no admin rights needed.
You're not on Windows
Mac, Linux and ChromeOS users can open .mbox files here without buying a separate platform-specific edition.
Privacy must be provable
The file never leaves your device and you can watch it happen: open the browser's Network tab while you work — no file bytes are ever transmitted.
Simple pricing
Viewing and CSV export are free. A one-time $9.99 unlocks PDF export forever.
Free
$0
- Open mbox files of any size
- Read every message, download attachments
- Instant search over From / To / Subject
- CSV metadata export — no account, no upload
Lifetime license
$9.99 one-time · forever
- Merged PDF export of whole mailboxes
- Scope: all, search results, or selected messages
- Pay once, use forever — no subscription
- Support a small independent tool
By purchasing you agree to the Terms of Service and Privacy Policy. Full refund within 14 days if it can't handle your file.
Frequently asked questions
Is MBoxConvert a free alternative to SysTools MBOX Converter?
For viewing, searching and exporting metadata, yes — opening files of any size, reading every message, downloading attachments, search, and CSV export are free and unlimited. Only the merged PDF export costs $9.99 (one-time). SysTools MBOX Converter's free demo exports 25 items per folder; its full license is $39 one-time.
Do either of these tools upload my emails?
No — both process mail locally. MBoxConvert parses the file with JavaScript inside your browser tab (you can watch the Network tab: no file bytes are transmitted, and nothing is installed). SysTools MBOX Converter is a desktop application that processes files on your PC. The practical difference is that a browser tool needs no installation or admin rights.
Can MBoxConvert convert MBOX to PST like SysTools does?
No. MBoxConvert reads and searches mbox files and exports them as CSV (free) or one merged PDF ($9.99). If you need PST, EML, MSG, NSF or HTML output — for example to import a mailbox into Outlook — a desktop converter such as SysTools MBOX Converter is the right tool.
Which one works on Mac, Linux or ChromeOS?
MBoxConvert runs in any modern browser on any operating system — Windows, macOS, Linux, ChromeOS. SysTools MBOX Converter is a Windows application (Windows 11/10/8.1/8/7); SysTools sells a separate Mac edition.
Which one handles very large MBOX files better?
Both are built for big mailboxes. MBoxConvert streams the file in 2 MB chunks and keeps only per-message metadata in memory, so multi-gigabyte Gmail Takeout exports open in the browser without installing anything. SysTools MBOX Converter offers batch and folder modes for converting many files on a desktop PC.