Kindle File Format
| Filename extension |
.azw, .azw3, .kfx |
|---|---|
| Internet media type |
application/vnd.amazon.mobi8-ebook |
| Developed by | Amazon.com |
| Initial release | 2007 |
| Latest release | 10 11 August 2015 |
| Type of format | e-book file format |
| Extended from | HTML5, CSS3, MOBI |
| Open format? | No |
Kindle File Format is a proprietary e-book file format created by Amazon.com that can be downloaded and read on devices like smartphones, tablets, computers, or e-readers that have Amazon's Kindle app. E-book files in the Kindle File Format originally had the filename extension .azw; version 8 (KF8) introduced HTML5 & CSS3 features and had the .azw3 extension; and version 10 introduced a new typesetting and layout engine featuring hyphens, kerning and ligatures and has the .kfx extension.