application/epub+zip
The MIME type for EPUB e-books — XHTML + CSS packaged inside a ZIP, designed for reflowable text.
Typical extensions
Primary uses
- E-book store distribution
- Offline delivery
In a browser
Edge's built-in reader previews EPUB; other browsers hand off to associated readers.
On a server
Correct `Content-Type: application/epub+zip` lets Safari on iOS hand the file straight to Books.app.
In email
A common attachment format. Size varies with embedded images.