Online AZW3 Converter

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Information about AZW3 file format

Name AZW3
Full name Amazon KF8 eBook File
File extension .azw3
MIME type application/octet-stream
Developed by Amazon
Type of format
Description AZW3 - Kindle Format 8 (KF8) is Amazon's newer version of AZW. It supports HTML5 and CSS3 which were not supported through the standard AZW format. It has a number of other formatting options and is used by Amazon for all new Amazon eBooks. It is supported by fourth-generation Kindle devices running firmware version 4.1.0 or later and the Kindle Fire device.
Technical details KF8 (also called AZW3) is essentially a compiled ePub that has utlises a Palm database and Amazon's DRM scheme. It targets ePub 3 version support but existing ePub can also be used. The internal format has been decoded using mobi_unpack. The basic format remains as a PDB file similar in structure to a MOBI. More oftent than not a KF8 file will contain both a MOBI file at the beginning and the newer KF8 version of ePub later.
Associated programs Kindle Fire, Kindle Reader, Kindle for Android, Kindle for iOS
Wiki https://en.wikipedia.org/wiki/Kindle_File_Format