MSG to GZ Converter
Processing entirely on your device — large files may take a moment.
Unpack a .gz into a normal file or repack it as ZIP/TAR when the receiving tool does not understand gzip. If your files are still in MSG format, this page is the shortcut: 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.
iLoveConverter processes everything locally on your computer, which makes it private and fast: no upload wait, no server storage, no limits. Add as many files as you like — batch conversion is built in.
How MSG compares to GZ
| MSG | GZ | |
|---|---|---|
| Layout | As saved in Outlook | One compressed member |
| Best for | Archived Outlook correspondence | Logs, dumps, datasets |
How to convert MSG to GZ
- 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 GZ format
A .gz file is one file squeezed by gzip — not an archive. kernel.org tarballs are “tar inside gz”, but plenty of logs, JSON dumps and CSV exports travel as plain .gz. Opening one means decompressing it back to the original bytes.
Repacking into ZIP or TAR gives the decompressed file a container that every GUI tool opens without a second thought.
+Strengths
- ✓Everywhere on Linux and macOS
- ✓Fast, well-understood compression
- ✓Streams natively from any tool
!Limitations
- −Single file only — no directory tree
- −No encryption or integrity metadata
Why convert MSG to GZ?
Converting makes sense where the strengths of GZ meet what MSG cannot give you. Everywhere on Linux and macOS 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 GZ 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 GZ?
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.
Are the files inside my MSG archive modified?
No. Contents are unpacked in memory and repacked into GZ byte-for-byte — the conversion changes the container, never the files inside it.
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.