InkskyAmazon added EPUB support to Send to Kindle in 2022, but your Kindle still can’t open an EPUB file via USB. Confusing, right? Here are the two methods that actually work to get EPUB books onto your Kindle.
Method 1: Send to Kindle (easiest)
Amazon’s Send to Kindle service converts EPUB to Kindle format on their servers and delivers the book to your device. This is the official, recommended way.
Steps:
- Go to amazon.com/sendtokindle
- Drag your EPUB file onto the page
- Select your Kindle device from the dropdown
- Click Send
The book appears in your Kindle library within minutes, synced across all your devices. You get Whispersync, Goodreads integration, and cloud backup — everything that comes with a store-bought Kindle book.
Limitations: The 200MB file size cap. For large EPUB files (textbooks, comic compilations), you’ll need Method 2.
Method 2: Convert with Calibre (most control)
Calibre converts EPUB to AZW3 or KFX locally, giving you more control over formatting. This is better for books with complex layouts, custom fonts, or large file sizes.
Steps:
- Open Calibre and add your EPUB to the library
- Select the book, click Convert Books → Convert Individually
- Output format: choose AZW3 (best compatibility) or KFX (enhanced typography)
- Click OK, wait for conversion
- Connect your Kindle via USB, click Send to Device
AZW3 preserves most EPUB formatting and works on every Kindle. KFX adds features like hyphenation and page flip, but requires Kindle Previewer to be installed alongside Calibre.
Which method should you use?
Send to Kindle is the right choice for most readers. It’s fast, wireless, and keeps your books synced. Use Calibre when you need specific formatting adjustments, when a file exceeds 200MB, or when you want sideloaded books to coexist with a Calibre-managed library.