EPUB ebooks might be convert to Kindle AZW3 format with programs like Calibre or Hamster which should be more than enough for epub to azw3 conversion or similar. This is especially handly if you want to use commonly available *.epub publications in your Kindle. This will create non-DRM protected ebooks only.
In Calibre for example, you can do the following to convert EPUB to AZW3
- Right-Click on the EPUB and select Convert books ► Convert Individually
- Select AZW3 as output format in the support right box ► OK
- Then right-click on the book again and select save to disc ► Save single format to disc..
- Select AZW3 and the output folder
- And that's it, in the output folder a new folder with the name of author / name of book / and book files (azw3, opf and jpg (cover)) was created.