MSG to XZ Converter
Processing entirely on your device — large files may take a moment.
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. Unpack XZ into ZIP/TAR for tools that cannot read LZMA2.
Because the whole conversion happens on your device, it is instant, unlimited and genuinely private — no accounts, no watermarks, no files on anyone's server. Multiple files are converted in one go.
How MSG compares to XZ
| MSG | XZ | |
|---|---|---|
| Layout | As saved in Outlook | One compressed member |
| Best for | Archived Outlook correspondence | Packages and releases |
How to convert MSG to XZ
- 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 XZ format
XZ wraps the LZMA2 algorithm: the best ratio of the common Unix compressors, which is why distribution packages and source releases pick it when bandwidth matters more than CPU.
Windows Explorer and many cross-platform tools cannot open it — unpacking to ZIP or TAR makes the payload portable.
+Strengths
- ✓Highest common ratio
- ✓Standard for Linux packages
- ✓Integrity checks built in
!Limitations
- −Memory-hungry at high settings
- −Sparse support outside Linux
Why convert MSG to XZ?
Think of it as moving your file to the container that fits the job. Attachments are listed but not extracted here XZ works differently: Highest common ratio If any of that sounds like your task, run the conversion — it takes seconds and nothing leaves your device.
Frequently asked questions
Is this MSG to XZ 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 XZ?
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.
Are the files inside my MSG archive modified?
No. Contents are unpacked in memory and repacked into XZ byte-for-byte — the conversion changes the container, never the files inside it.