.7z MIME type
7-Zip archivearchives
application/x-7z-compressed7-Zip archives with high compression ratios.
| MIME type | application/x-7z-compressed |
|---|---|
| Extensions | .7z |
| Content-Type | application/x-7z-compressed |
| Compress in transit? | No — already compressed |
| File signature | 37 7A BC AF 27 1C (7z¼¯'.) |
Good to know
- Not natively supported by older Windows or macOS versions; ZIP is the safer choice for downloads aimed at everyone.
Serve .7z files with the right type
The response header to send:
Content-Type: application/x-7z-compressed
Most servers pick the type from the file extension. If yours sends the wrong one, map it explicitly:
nginx (inside the types block in mime.types)
application/x-7z-compressed 7z;
Apache (.htaccess or server config)
AddType application/x-7z-compressed .7z
Express
res.set("Content-Type", "application/x-7z-compressed");Python
import mimetypes
mimetypes.add_type("application/x-7z-compressed", ".7z")HTML file input
<input type="file" accept=".7z,application/x-7z-compressed">
Check it
See what a server sends for a file, and what type a local file really is by its contents:
curl -sI https://example.com/file.7z | grep -i '^content-type:' file --mime-type file.7z
Frequently asked questions
What is the MIME type for .7z files?
application/x-7z-compressed.
What Content-Type header should a .7z file be served with?
Content-Type: application/x-7z-compressed. It's already compressed, so servers shouldn't gzip it.
How can I tell if a file is really a .7z?
Check its bytes rather than the extension: 7Z files start with 37 7A BC AF 27 1C. On the command line, file --mime-type name.7z does this for you.
Related types
Headers that go with it: Content-Type · Content-Disposition · X-Content-Type-Options