Mobipocket E-Book (.MOBI)
MOBI (Mobipocket) is an e-book format originally developed by Mobipocket SA and later acquired by Amazon for the Kindle platform. It is based on the Open eBook standard with proprietary extensions for DRM and Kindle-specific features. While Amazon has largely transitioned to newer KF8/AZW3 formats, MOBI remains widely used for sideloading e-books onto older Kindle devices.
Advantages of Mobipocket E-Book
What the MOBI format does well, and why you might choose it.
- Compatible with all generations of Amazon Kindle devices
- Supports basic formatting, images, and table of contents
- Well-established format with extensive existing e-book libraries
Limitations of Mobipocket E-Book
What the MOBIformat doesn't do well, and when to choose another format.
- Proprietary format with declining support as Amazon moves to newer formats
- Limited formatting capabilities compared to EPUB or AZW3
- Amazon stopped accepting MOBI uploads to Kindle Direct Publishing in 2023
What MOBI files are used for
- Sideloading e-books onto older Kindle devices via USB
- Legacy e-book collections and personal digital libraries
- E-book conversion as an intermediate format for Kindle delivery
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Frequently asked questions about MOBI
What is a .MOBI file?
MOBI (Mobipocket) is an e-book format originally developed by Mobipocket SA and later acquired by Amazon for the Kindle platform. It is based on the Open eBook standard with proprietary extensions for DRM and Kindle-specific features. While Amazon has largely transitioned to newer KF8/AZW3 formats, MOBI remains widely used for sideloading e-books onto older Kindle devices.
What is the MIME type of MOBI?
The official MIME type for MOBI files is application/x-mobipocket-ebook. This is the value web servers and applications use to identify the format when transferring files.
What category does MOBI belong to?
MOBI is a E-Book Converter format. Files in this category share common conversion paths and use cases.
How do I open a .MOBI file?
MOBI files are typically opened by software that natively supports the Mobipocket E-Bookformat. If you don't have a compatible application, the most reliable approach is to convert the file to a more universal format using the converters listed above. Most Mobipocket E-Book files convert to widely-supported alternatives in seconds.
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