What is MOBI/AZW3?
The Kindle family (.mobi, .azw3, .azw) is Amazon's proprietary e-book format: reflowable, with navigation, read mainly on Kindle devices and the Kindle app.
About the format
Mobipocket (.mobi) was long the default format Amazon accepted for Kindle delivery. AZW3 (also called KF8) is its successor with fuller HTML5/CSS support, and .azw is an earlier Amazon container. All three reflow and carry navigation and metadata, so they behave as one family. They are proprietary to Amazon's ecosystem, and since 2022 Amazon sends KFX/EPUB instead, so .mobi is mostly a legacy format now.
| Extensions | .mobi.azw3.azw |
|---|---|
| Typical use | Reading on Kindle devices and the Kindle app; one of the most common proprietary formats in existing libraries. |
Converting from MOBI/AZW3
Converting into MOBI/AZW3
Other formats
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