MSG to BZ2 Converter
Processing entirely on your device — large files may take a moment.
Outlook Message and BZip2 Compressed File exist for different jobs: MSG is Outlook's saved-email format: an OLE compound file holding headers, the HTML/plain body, recipients and attachments. It only opens properly inside Outlook — everywhere else it is a black box. Convert BZ2 to ZIP or TAR when modern tools need a friendlier container.
This converter runs entirely in your browser using WebAssembly — your files never leave your device, nothing is uploaded, and there are no watermarks, sign-ups or queues. Drop in several files at once to convert them as a batch.
How MSG compares to BZ2
| MSG | BZ2 | |
|---|---|---|
| Layout | As saved in Outlook | One compressed member |
| Best for | Archived Outlook correspondence | Large text dumps |
How to convert MSG to BZ2
- 1
Select your files
Select your MSG file.
- 2
Convert instantly
The file bytes are gzip-compressed in place — the same archive your server or build tool produces, made locally.
- 3
Download results
Download the .gz file — ready to upload, serve or attach.
About the MSG format
A .msg file is Outlook's saved email: an OLE compound document that stores headers, the HTML or plain-text body, recipients, flags and attachments. It opens cleanly only inside Outlook itself — everywhere else, including most web mail tools, it is an opaque binary.
Converting MSG to HTML or TXT puts the correspondence where people can actually read it — archives, discovery tools, CRM imports. Converting to EML hands it to every other mail client, which all speak the open RFC-822 standard instead of Outlook's container.
+Strengths
- ✓Preserves Outlook-only correspondence
- ✓Body, headers and attachment names survive
- ✓EML output opens in Thunderbird and every client
!Limitations
- −Attachments are listed but not extracted here
- −Outlook-specific flags and categories are lost
- −Complex RTF bodies may simplify to text
About the BZ2 format
BZ2 applies the Burrows–Wheeler transform: slower than gzip but noticeably smaller, which is why Wikipedia database dumps and old source tarballs still arrive as .bz2.
Few GUI tools ship a bz2 reader these days, so converting the contents into a ZIP or TAR is the practical way to hand the payload to someone else.
+Strengths
- ✓Better ratio than gzip
- ✓Common in dumps and archives
- ✓Mature, stable format
!Limitations
- −Slow to compress and decompress
- −Declining tool support
Why convert MSG to BZ2?
Converting makes sense where the strengths of BZ2 meet what MSG cannot give you. Better ratio than gzip Meanwhile Attachments are listed but not extracted here One pass through the converter above puts your file on the right side of that trade-off.
Frequently asked questions
Is this MSG to BZ2 converter really free?
Yes — completely free, with no sign-up, no watermark and no daily conversion limits. The site is supported by advertising.
Are my files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so your files never leave your device — that is what makes it instant and private.
Does it work on Windows, Mac, iPhone and Android?
Yes. Anything with a modern browser works: Windows, macOS, Linux, Android and iOS. No software installation is required.
Is there a file size limit for MSG to BZ2?
The only limit is your device's memory, since nothing is uploaded. Files up to a few hundred megabytes work fine on a modern desktop browser; very large files simply take a little longer.
Is there a size limit for archive conversion?
There is no upload cap because nothing is uploaded — the practical limit is your device memory. A few hundred megabytes of unpacked content works comfortably on a modern computer.
What about folders and directory structure?
The full directory tree is preserved: folders stay folders, and deep paths arrive exactly as they were packed in the MSG file.