- Download the EPUB.
- Open amazon.com/sendtokindle and drop the file in, or use the Send to Kindle app / your Kindle e-mail address.
- Amazon converts it to Kindle format automatically and syncs it to your device.
About AZW3 / KFX: these are Amazon’s proprietary formats and cannot be created honestly inside a web page. Send the EPUB to Kindle, or convert it with Calibre or Kindle Previewer if you need an AZW3 file.
