You can prepare all kinds of ebooks from documents and same goes for Kindle books (.azw3) made from MS Word documents (.doc, .docx). It can be done with ebook managers and converters like the popular Calibre software which is available as free download on the developers website.
Home > Search converters: docx to azw3
Conversion of docx file format to azw3 file format beta
Search for docx to azw3 converter or software able to handle these file types.
Convert Microsoft Word Open XML document to Amazon Kindle eBook.
We have found 3 software records in our database eligible for .docx to .azw3 file format conversion.
Articles and other information relating to docx into azw3 conversion:
How to convert ebooks to formats supported in Amazon Kindle - Converting ebooks for Amazon Kindle reader
Microsoft Windows software 
- convert docx to azw3 on Windows
Calibre
A free e-book library management application
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from docx file | No | No | No | No | No | Yes | No | No |
to azw3 file | Yes, Calibre supports azw3 file conversion as a target file type. | No | No | No | No | No | No | No |
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned docx to azw3. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software 
- convert docx to azw3 on OS X
Calibre for Mac
A free open source ebook creator, converter and viewer
Linux/Unix software 
- convert docx to azw3 on Linux
Calibre for Linux
Linux version of the popular ebook manager
Additional links: Open docx file, Open azw3 file
DOCX
Files with docx file extension are documents written and saved using Microsoft Word word processor edition 2007 or later. DOCX format replaced the previously used DOC format, moving from a binary files to Open XML schema based documents. Supported in almost every modern word processing tools.
AZW3
Files with azw3 file extension may be found as e-book used in the latest Amazon Kindle digital reader. A format exclusive to Kindle, similar to EPUB.
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