I've spent a lot of time figuring out the best ways to share Kindle books legally and conveniently. Amazon Kindle books have DRM protection, which means you can't directly share downloaded files like regular documents. However, you can use Amazon’s official 'Family Library' feature to share books with up to five family members. Just go to 'Manage Your Content and Devices' on Amazon, select the book, and choose 'Add to Family Library.'
Another method is using Kindle’s 'Lend' feature, which allows you to loan eligible books for 14 days. Not all books support this, but when they do, it’s a great way to let friends enjoy your favorites. If you want to share beyond these options, consider converting DRM-free books (like public domain works) to EPUB or PDF using Calibre, then sending them via email or cloud storage. Always respect copyright laws—sharing paid books without permission isn’t just unethical, it’s illegal.