MOBI eBook
eBooksMOBI is a legacy ebook format. Reflowable text and image-based books behave differently when converted. Distinguish protected purchases from your own unprotected documents, and check current Amazon submission/transfer formats.
- What it is used for
- Legacy ebooks and personal documents
- What the file contains
- Binary data
All sections, questions and sources
Content reviewed： · Editor：Kai
Opening steps
Choose your environment or purpose to see its steps.
Menu labels and support vary by app, OS and version. Preserve the original before making changes.
Troubleshooting by symptom
- Transfer rejected: check supported formats and prepare an accepted format such as EPUB for an unprotected manuscript.
- Duplicate contents: distinguish inline contents from navigation metadata; test chapter navigation.
- Text will not enlarge: check whether pages are images/fixed layout and inspect resolution.
- Images missing: compare source illustrations chapter by chapter.
- Cannot return from notes: inspect navigation in the destination reader.
- Duplicate cover: distinguish inserted cover and an existing cover page.
Unprotected MOBI → EPUB
- Select the book in calibre and create a separate EPUB through Convert books.
- Check cover, navigation, text, illustrations and chapter order on the destination reader.
- Verify navigation through the final chapter on the destination reader.
This is not DRM removal; layout/annotations may not transfer completely. Retain the source.
Reading, delivery and publishing
Check the official workflow for each purpose rather than inferring service support from local reading.
Example: review illustrated chapters, notes and the ending as well as the first pages.
Source for these steps：calibre · Frequently Asked Questions — supported formats / Amazon KDP · MOBI Support for eBooks Frequently Asked Questions / Amazon · Connect, Browse, and Transfer Files on E-Reader
Review converted chapters
Inspect image chapters, navigation, notes and vertical text; return to the source when automatic conversion is insufficient.
Source for these steps：calibre · Frequently Asked Questions — supported formats / Amazon KDP · MOBI Support for eBooks Frequently Asked Questions / Amazon · Connect, Browse, and Transfer Files on E-Reader
Related-format differences
| Format / method | Role | What to verify |
|---|---|---|
| MOBI | Legacy ebook | Reader/service support |
| EPUB | Distribution/submission | Layout validation |
| Editable source | Revision | Text/assets |
Handling and security
Check purchase/distribution rights and avoid unauthorized cloud upload of personal documents.
Questions and answers
Can I submit MOBI to current KDP?
Amazon has ended MOBI submissions; prepare a currently accepted manuscript.
Does renaming make EPUB?
No; conversion and validation are needed.
Can every purchased book be converted?
Protection and terms matter; follow the authorized provider workflow.
Can a readable legacy book still be rejected for publication?
Reader compatibility does not determine submission acceptance; follow current publishing rules.
Should I keep only the converted EPUB?
Keep the original and editable source because layout or navigation can change.
Format facts: name, steward and MIME type
- Formal name
- Mobipocket / Kindle MOBI ebook
- Steward / specification
- Mobipocket / Amazon
- MIME type
- Depends on the producer or server; an extension alone does not establish a MIME type.
Primary and official sources
- Software documentationFrequently Asked Questions — supported formats
Lists supported ebook input/output formats and MOBI/AZW3 behavior.
calibre · Link checked： - Platform documentationMOBI Support for eBooks Frequently Asked Questions
Explains the end of KDP MOBI submissions and alternatives.
Amazon KDP · Link checked： - Platform documentationConnect, Browse, and Transfer Files on E-Reader
Explains Send to Kindle formats and USB transfer conditions.
Amazon · Link checked：