ebook Format
MOBI File Format
Mobipocket eBook was the primary format used by Amazon Kindle devices before being superseded by KF8 and EPUB.
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Technical Specifications
| Extensions | .mobi |
| MIME Types | application/x-mobipocket-ebook |
| Category | eBook |
| Engine Tier | tier1-small-js |
| Magic Bytes / Sniffing | Container sniffing (ZIP / OLE2 / RIFF header inspection) |
| Opens With | Amazon Kindle, Calibre |
| Good For | Reading older Kindle book files on legacy Amazon hardware. |
| Not Recommended For | Modern e-readers, as Amazon now recommends EPUB. |