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Sumatra PDF

Sumatra PDF supports viewing mobi ebooks since version 2.0. Sumatra is free, open-source and supports many other formats, like PDF, XPS, DjVu, CBR, CBZ.


FBReader is a cross-platform, open-source eBook reader that can also read mobi files.

Mobipocket Reader

Mobipocket Reader supports mobi format (among others).

Details of mobi format

Mobi format was invented by French company MobiPocket as an ebook format for their MobiPocket Reader application. The company was bought by Amazon and the format was used in Amazon's Kindle. Unfortunately Amazon added DRM to the format, which means that only Amazon's software or devices are able to read ebooks purchased from Amazon.

Mobi format is a simplified and adapted HTML. There is no official documentation of the format, but it has been reverse-engineered and documented by the citizens of the internet.

Mobi files usually have .mobi extension. Amazon's eBooks have .azw extension. Because the format was originally designed for Palm Pilot PDAs, they can also have .prc or .pdb extension.

Free mobi books

List of websites that offer free ePub/mobi eBooks for download.

Other eBook formats

A list of ePub format readers.

A list of CHM format readers.

This list was made by Krzysztof Kowalczyk