What to KnowUse the Silk browser to find e-books on the web, download them to your device, then go to the Docs app to find them.Transfer books from your computer to your Kindle Fire using a USB cable (and the Android File Transfer utility for Mac).Go to the Manage Amazon Devices page and select your device to find your Kindle email address, then send the e-book to the address.
This article explains how to load books on your Kindle Fire from outside the Kindle Store. Instructions in this article apply to all Amazon Fire tablets.
Download E-Books With the Kindle Browser
If you purchase legal, non-DRM protected e-books from other sellers, you can easily transfer those books to your device. There are also of websites with free e-books that you can download to your device using the Amazon Silk browser. Files you download can be found in the Docs app.
Tap a file to open it. If it's in the standard MOBI for Kindle Fire format, the book opens in the Kindle reader app.
How to Transfer E-Books From PC to Kindle Fire via USB
You can transfer files to and from your Kindle Fire as if it were an external hard drive using a USB cable:
On a Mac, install the Android File Transfer utility to complete the USB transfer.
Connect your Fire tablet to your computer with a micro-USB cable.
If this is your first time connecting the Fire tablet to a computer, swipe down from the top of the tablet's screen and tap USB charging this device.
You can skip to step 4 if your PC already has access to your tablet.
Tap Transfer files to allow access to the device.
On your computer, open the device folder and select Internal Storage.
Drag-and-drop MOBI files in the Books folder, and place PDFs and other files in the Documents folder.
Disconnect the tablet from the PC. After you add your files, you may need to restart the Kindle to get it to recognize the new books.
You can also transfer files to your Fire tablet using the Dropbox app for Fire OS.
Send E-Books to Kindle via Email
It's also possible to send files from your PC to your Kindle Fire using a special email address. To find your Kindle email address on newer Fire devices, open the Docs app and tap Email Docs to your Fire under Send-to-Kindle. When you attach a file to an email and send it to the specified address, the file automatically appears in Docs.
There's another way to find your Kindle's email address. Log in to your Amazon account on your PC, go to the Manage Amazon Devices page, and then select your device. You should see the device's email address listed.
What Reader Format to Use for Amazon Fire Tablets
The Amazon Kindle app natively reads MOBI files. If you have a book in ePub format, you can read it, but you need to either convert the ePub file or install a separate reading app on your Fire.
Other supported file types for Kindle books include:AZWKPFPRCTXTPDFDOCDOCX
If an e-book isn't in the standard MOBI format, it won't appear in the Kindle app. PDFs and other types of files can be found in the Docs app.