For DRM-free books (like those from Baen), you can simply plug your Kindle into a computer and drag the files into the "documents" folder.
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Download the EPUB file from the retailer and upload it via the Amazon Send to Kindle web page or email it to your device's unique Kindle email address. For DRM-free books (like those from Baen), you
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While Amazon is the default, you can buy Kindle-compatible ebooks from several alternative retailers and even borrow them for free through library services. Because Kindle now supports files through the "Send to Kindle" service, your options for where to shop have expanded significantly. Top Retailers for Kindle-Compatible Ebooks Why It’s Great for Kindle eBooks.com
You don't always need to buy. The Libby app is the most popular way to borrow ebooks from your local public library. Once you sign in with a library card, you can browse their digital catalog and select "Read with Kindle" to send the book directly to your device for the duration of the loan. How to Get These Books Onto Your Kindle