Turn EPUB e-books into AZW3. This conversion runs on our server: after you confirm, the file is uploaded over an encrypted connection, converted and then deleted.
Drop EPUB files here
or choose from your computer paste with Ctrl V
from Photos or Files
Ready · other file types work tooAsks before any upload
Drop EPUB files onto the box above, or click it to choose them. ToAny reads the file's contents to detect the type, so a wrong extension does not matter.
Press Convert and confirm the upload. The file is sent to the ToAny conversion server, converted to AZW3 and removed afterwards.
Save the AZW3, or download everything as one ZIP if you converted several files.
Browsers cannot convert EPUB to AZW3 reliably, so this pair runs on our server. You are asked before anything is sent, and the page says so plainly.
The uploaded file and the result are deleted once the conversion has finished. Nobody looks at them and they are not used for anything else.
No sign-up, no email address and no watermark on the result.
EPUB needs an e-reader app and does not print with a fixed layout. AZW3 is the native format of modern Kindles. EPUB is at home in e-books that adapt to any screen size; AZW3 is the usual choice for books on Kindle.
EPUB is the open standard for e-books. Text reflows to fit the screen and the reader chooses the font and size. Almost every e-reader other than older Kindles opens it directly.
Opens in Apple Books, Kobo, Google Play Books, Calibre and, since 2022, Send to Kindle
EPUB converterAZW3, also called Kindle Format 8, replaced MOBI on Kindles in 2011 and added proper HTML5 and CSS styling. Only Amazon's readers and Calibre open it.
Opens in Kindle devices and apps, Calibre
AZW3 converter| EPUBEPUB e-book | AZW3Kindle e-book (AZW3) | |
|---|---|---|
| Stands for | Electronic Publication | Kindle Format 8 |
| Type | Reflowable e-book | Reflowable e-book |
| Compression | ZIP container of XHTML | Proprietary container |
| Introduced | 2007, by the International Digital Publishing Forum (now W3C) | 2011, by Amazon |
| Opens in | Apple Books, Kobo, Google Play Books, Calibre and, since 2022, Send to Kindle | Kindle devices and apps, Calibre |
| Best for | E-books that adapt to any screen size | Books on Kindle |
| File extension | .epub | .azw3, .azw |
Yes, for this conversion. Browsers cannot convert EPUB to AZW3 reliably, so after you confirm, the file is uploaded over an encrypted connection to the ToAny conversion server, converted automatically and deleted once the conversion has finished. Most other conversions on ToAny run in your browser and upload nothing.
Text is kept. Formatting carries over only as far as AZW3 supports it.
Yes. Add as many as you like, convert them together and download each result or all of them as one ZIP.
The steps are the same everywhere because ToAny runs in the web browser: open this page in a current version of Chrome, Edge, Safari or Firefox, add the EPUB file, press Convert and save the AZW3. There is nothing to install.
Yes. Files sent to the conversion server are capped in size, and the page tells you when a file is too large to upload.