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The device supports books in both formats.
Sorry, there was a problem. Please try again later.I don't currently own an Amazon Fire HD but was researching the same question before making the move. Here's what I found out: https://www.lifewire.com/load-non-amazon-books-kindle-1616647 Quick answer: Yes! "File Formats for Kindle Fire Amazon Kindle natively reads .mobi files. If you have a book in ePub format, you can still read it, but you'll either need to convert it using a program like Calibre or install a separate reading app like Aldiko on your Fire. Supported file types for Kindle books include: Kindle Format 8: Amazon's version of the EPUB3 standard MOBI AZW: A copy-protected version of MOBI PRC" Hope this helps.
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