.epub
Low riskElectronic Publication
The IDPF / W3C standard for e-books. Under the hood it is XHTML + CSS + metadata inside a ZIP — designed for reflowable text.
MIME types
- application/epub+zip
Category
document
What opens this file
- Apple Books
- Calibre
- Thorium Reader
- Kindle Previewer
- Adobe Digital Editions
How to open by OS
Windows
- Calibre, Thorium Reader, Edge (built-in reader).
Mac
- Apple Books, Calibre, Thorium.
Linux
- Calibre, Foliate.
Ios
- Books, Kybook.
Android
- Google Play Books, Moon+ Reader.
Safety notes
- Readers that permit JavaScript inside EPUBs open XSS-class risks. Pick readers that disable it by default.
Common mistakes
- Fixed-layout EPUBs struggle on smaller devices — ship reflowable content when you can.
- DRM-protected
.acsmfiles are only readable through Adobe Digital Editions.