.MOBI File Extension

Mobipocket eBook

Developer Amazon
3.9  |  137 Votes
Category eBook Files
Format Binary

What is a MOBI file?

A MOBI file is an eBook saved in the MOBI format, a format originally used by the Mobipocket Reader but now supported by several different readers. It contains an eBook and may incorporate DRM copyright protection to prevent copying or unauthorized viewing. MOBI files are supported by various eReaders, tablets, PDAs, and desktop computer applications.

More Information
Screenshot of a .mobi file in Calibre 3
MOBI file open in Calibre 3

Amazon's new Kindle Format 8 (KF8) is based on the MOBI format. KF8 supports many new formatting and layout options, including HTML5 and CSS3 content and embedded fonts. KF8-formatted eBooks are saved and distributed as ".mobi" files or as .AZW3 files, depending on the device that downloads the eBook. eBook authors can compile KF8 books using Amazon's KingleGen software. Before distribution, authors can preview KF8 eBooks on a Mac or PC with Amazon's Kindle Previewer software.

Amazon now owns the MOBI format. Amazon's eBook formats, including .AZW, .AZW1, and AZW3, use the MOBI format but incorporate a proprietary DRM scheme.

NOTE: Mobipocket eBooks also use the .PRC extension.

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Programs that open MOBI files

Updated May 16, 2019

Verified by FileInfo.com

The FileInfo.com team has independently researched the Mobipocket eBook file format and Mac, Windows, Linux, and Android apps listed on this page. Our goal is 100% accuracy and we only publish information about file types that we have verified.

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