Convert EPUB to AZW3 online in seconds — free, with no sign-up. AZW3 is lossless and ideal for Kindle devices. Your files are encrypted and deleted automatically after 24 hours.
EPUB
Electronic Publication — The open ebook standard with reflowable text, supported by most readers.
How to convert EPUB to AZW3
- 1Upload your EPUB file
Click “Choose a file” or drag and drop your EPUB file onto the page — no sign-up or email needed.
- 2Convert to AZW3
AZW3 is already selected as the output. Open Options to fine-tune quality if you like, then click Convert.
- 3Download your AZW3 file
Your AZW3 file is ready in seconds — click Download to save it. Files are automatically deleted after 24 hours.
EPUB vs AZW3
| EPUB | AZW3 | |
|---|---|---|
| Full name | Electronic Publication | Kindle Format 8 |
| Type | Ebook | Ebook |
| Compression | Lossless | Lossless |
| Best for | publishing to Apple Books, Kobo, Google Play and most e-readers | Kindle devices |
Frequently asked questions
Does converting EPUB to AZW3 lose quality?
Converting EPUB to AZW3 keeps your content intact. We use high-quality defaults so your AZW3 file looks as close to the original as the format allows.
What's the difference between EPUB and AZW3?
Electronic Publication (EPUB) is lossless and best for publishing to Apple Books, Kobo, Google Play and most e-readers. Kindle Format 8 (AZW3) is lossless and best for Kindle devices. Convert EPUB to AZW3 when you need a ebook for Kindle devices.
Is the EPUB to AZW3 converter free?
Yes — converting EPUB to AZW3 is completely free. There's no watermark, no sign-up and no email required, and you can convert as many files as you like.
Are my EPUB files private and secure?
Yes. Your uploads are encrypted in transit, processed privately, and automatically deleted within 24 hours. We never share, sell or look at your files.
Can I convert EPUB to AZW3 on iPhone, Android, Mac or Windows?
Yes. The converter runs entirely in your browser, so it works on any device — iPhone, iPad, Android, Mac, Windows or Linux — with nothing to download or install.
How long does it take to convert EPUB to AZW3?
Most files convert in a few seconds. Larger files take a little longer, and your upload speed is usually the limiting factor. There's no queue and no waiting for an email.
What else can I convert EPUB files to?
Besides AZW3, you can convert EPUB to DOCX, FB2, MARKDOWN, MD, MOBI, PDB and more — see the full list of EPUB conversions below.
Other conversions
Last updated July 2026