Every file format Kindle supports in 2025
Not every ebook file format works with Kindle. Here are all the supported formats, a method for converting unsupported ebook files to the Kindle format, and instructions for copying files to Kindle devices.
Supported Kindle file formats
These are all file formats you can use on a Kindle device in 2025.
- Amazon KF10 ebook (.azw, .kfx)
- Amazon KF8 ebook (.azw3)
- Amazon Print Replica ebook (.azw4)
- EPUB ebook (.epub)
- PDF document (.pdf)
- Microsoft Word document (.doc, .docx)
- Rich Text Format document (.rtf)
- Plain Text document (.txt)
- HTML page (.htm, .html)
- JPEG image (.jpg, .jpeg)
- PNG image (.png)
- BMP image (.bmp)
- GIF image (.gif)
How to convert unsupported ebook file formats to Kindle format
Several years ago, when I got my first Kindle, I found an ebook online that used the EPUB format. I wanted to download it, but I first needed to verify if Kindle supported it. It ended up that it didn’t, but it was possible to convert it to Amazon’s MOBI format. However, in 2022, Amazon discontinued support for its MOBI, PRC, and AZW formats but added support for EPUB.
Existing MOBI and AZW files in a Kindle Library are converted to the KF8 (.azw3) format, but adding new MOBI and AZW ebooks is no longer supported by Send to Kindle. Whereas EPUB files can now be added to a Kindle Library, and like pre-existing MOBI and AZW files, they are automatically converted to KF8 files.
If you have MOBI, PRC, or AZW ebook files you want to add to your Kindle, you’ll need to use Calibre to convert them to EPUB format and then use Send to Kindle to get them into your Amazon Digital Content library. You can then find them filed under Docs, not Books. If you want them filed under Books, convert them to the AZW3 format in Calibre and copy them to the device directly via USB. All Kindle devices can read the ebook once it’s added, regardless of where it’s filed. This is the method I use so I can read unsupported ebook file formats on my Kindle Scribe.
Like MOBI, PRC, and AZW, if you have an ebook format that Kindle doesn’t support, you can usually convert it to a compatible format using Calibre if it’s not protected by digital rights management (DRM).
How to copy supported ebook formats and documents to Kindle
Using Send to Kindle, supported Kindle file formats can be transferred to Kindle devices via the web, email, native iOS, Android, Mac, and Windows apps. Amazon also allows file copying via a Chrome extension and Microsoft Word.
It’s important to note that Amazon has limited copying to one way. Before February 26, 2025, you could download ebooks via a USB cable to your computer, but they removed the feature. This move concerns many readers because it means Amazon could remove or alter a book you purchased anytime, making buying a book more like renting.
About Jon Henshaw
Jon Henshaw started writing content to help others on the web in 1996. He's endlessly curious about human behavior (why we do what we do) and how we use technology daily. Jon has a bachelor's degree in Human Development and Family Studies and a master's degree in Psychology. He's married, has two adult children, and lives in Franklin, TN, USA.