EPUB to Kindle Format
Kindle devices don't natively open EPUB files, but Amazon now accepts EPUB via their Send to Kindle service and converts it automatically. Here's everything you need to know about getting your EPUBs onto a Kindle.
Option 1: Send to Kindle Email (Recommended)
Since late 2022, Amazon accepts EPUB files directly via email. This is the fastest method.
- Find your Kindle email address: Amazon.com → Manage Your Content and Devices → Preferences → Personal Document Settings
- Open your email client and compose a new email to your Kindle address (e.g., yourname@kindle.com)
- Attach your EPUB file (up to 50MB)
- Send — Amazon converts it to KFX format and delivers it to your Kindle within minutes
Make sure your sending email address is in the Approved Personal Document E-mail List in your Amazon settings.
Option 2: Send to Kindle App
Amazon's free Send to Kindle desktop app (Windows and Mac) lets you drag and drop EPUB files. Select your Kindle device, click Send, and the book appears on your device shortly.
Option 3: Convert to MOBI/AZW3 with Calibre
For older Kindles that don't support the email method, use Calibre to convert EPUB to AZW3 format, then transfer via USB. This gives you the most control over formatting.
Option 4: Convert to PDF
If formatting doesn't transfer well, you can convert your EPUB to PDF and send the PDF to your Kindle. PDFs display as fixed-layout pages on Kindle.
Prepare Your EPUB for Best Results
- Validate your EPUB — fix errors that could cause conversion issues
- Fix metadata — set the correct title and author for your Kindle library
- Add a cover image — it'll show on your Kindle home screen
- Compress the EPUB — keep it under 50MB for the email method
Kindle Format Explained
Kindle uses proprietary formats internally: AZW3 (older) and KFX (current). When you send an EPUB to Kindle, Amazon converts it to KFX automatically. You don't need to worry about these formats — just use EPUB and let Amazon handle conversion. MOBI is deprecated and Amazon stopped accepting MOBI uploads in 2023.
Related Guides
- How to send EPUB to Kindle — detailed walkthrough
- EPUB vs MOBI — why EPUB is now the standard
- How to open EPUB files on any device
- What is an EPUB file?
- All free EPUB tools
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