Free AZW3 to EPUB converter

AZW3 to EPUB converter that passes the official check

To convert AZW3 to EPUB, choose your file: the chapters, pictures and cover come through, in an EPUB that passes the official validator, free and without an account.

Convert an AZW3 to EPUB

No sign-up
Deleted within an hour
Opens in any reading app

Free: 10 files a day. Only convert books you have the right to convert. DRM-protected books, such as most store-bought Kindle books, can't be converted.

alice.epub epubwise

Text kept                           100%Contents entries                      16Pictures                               2Real headings                         20File size                         185 KBEPUB version                         2.0EPUBCheck errors                      57

Text kept                           100%
Contents entries                      16
Pictures                               2
Real headings                         20
File size                         185 KB
EPUB version                         3.0
EPUBCheck errors                       0

EPUB 2.0<footer id="pg-footer" lang="en">Not allowed in this version

EPUB 3.0

<footer id="pg-footer" lang="en">

Allowed in this version

ERROR(RSC-005): alice.epub/text/part0016.html(11,63): Error while parsing file: element "footer" not allowed anywhere; expected element "address", "blockquote", "del", "div", "dl", "h1", "h2", "h3", "h4", "h5", "h6", "hr", "ins", "noscript", "ns:svg", "ol", "p", "pre", "script", "table" or "ul" (with xmlns:ns="http://www.w3.org/2000/svg")Messages: 0 fatals / 57 errors / 0 warnings / 0 infosEPUBCheck completedCheck finished with errors

No errors or warnings detected.
Messages: 0 fatals / 0 errors / 0 warnings / 0 infos
EPUBCheck completed

Project Gutenberg's AZW3 of Alice in Wonderland, and the EPUB each made: Calibre's default first, then epubwise's. On the book itself they are level: the difference is the EPUB version. Unedited output.

What an AZW3 file is

AZW3, also called KF8, is the Kindle format that followed MOBI. Inside it is close to an EPUB: styled chapters, embedded fonts and pictures, all packed into Amazon's container. That is why it converts cleanly. The styling has somewhere to go, and the result usually looks like the original book, not like a plain text dump.

You will mostly meet DRM-free AZW3 files from three places: ebook tools that export for Kindle, independent publishers and book bundles that hand them out, and backups of books you formatted yourself.

How it compares: 8 AZW3 to EPUB converters tested

Tested 4 November 2026. Two public-domain Kindle files from Project Gutenberg (Alice's Adventures in Wonderland and The Adventures of Sherlock Holmes) went through each converter's free tier with default settings and no account. One script measured every EPUB the same way, and EPUBCheck, the official validator, checked each one (errors are the two books added together).

Converter	Text kept	Contents	Title, author, cover	EPUBCheck errors	Format
epubwise Calibre 9.17, plus our clean-up	100%	all	kept	0	EPUB 3
Calibre (default settings) Calibre 9.13, the desktop program	100%	all	kept	114	EPUB 2
AnyConv Calibre 4.3	100%	all	kept	118	EPUB 2
CloudConvert Calibre 8.5	100%	all	kept	124	EPUB 2
Convertio Calibre 4.99	100%	all	kept	120	EPUB 2
FreeConvert Calibre 9.13	100%	all	kept	114	EPUB 2
online-convert.com Calibre 9.15	100%	all	kept	114	EPUB 2
epub.to Calibre 9.1	100%	all	kept	114	EPUB 2

What the numbers say. All of these run Calibre, and AZW3 is a modern format, so the text, the contents and the book details came through whole everywhere. The difference is the file itself. AZW3 books carry markup the older EPUB 2 standard doesn't allow, and the others pass it on: 114 or more validator errors, in a file that may still open but that strict readers and stores can refuse. epubwise writes EPUB 3, which allows that same markup, repairs what's left, and keeps the older contents file so older e-readers can still use it.

Where others did better: nothing we measured here. On reading the book itself, this one is close to a tie. Unsure whether you need the conversion at all? AZW3 vs EPUB explains the difference.

Moving a Kindle-format book to another reader

Convert
Use the box at the top of this page and save the EPUB.
Copy it over
Plug a Kobo or Nook into your computer and drag the EPUB onto it, or open the file in Apple Books or Google Play Books.
Read
Pick your own font and size; the chapters show up in the reader's contents menu.

Books from the Kindle store

A book bought on Amazon is protected with DRM and tied to your account, whatever its file is called. Those files can't be converted, and if you upload one the converter says so instead of handing back an empty book. Older, unprotected Kindle files in the MOBI format go through the MOBI to EPUB converter.

Like our other ebook-to-ebook tools, this one runs Calibre, the free ebook program, on our server. Files are deleted within an hour. Have a PDF instead? The PDF to EPUB converter rebuilds its pages into a flowing book.

Questions

What is the difference between AZW3 and AZW?

AZW is the older Kindle format, built on MOBI; AZW3 (KF8) is the newer one, with fuller styling. Both are converted here if they are DRM-free; an old .azw file goes through the MOBI to EPUB page.

Can I convert Kindle books I bought on Amazon?

No. Books from the Kindle store are DRM-protected, and the converter refuses them with a message saying so.

Does the EPUB keep embedded fonts?

Yes, fonts packed into the AZW3 file are carried into the EPUB, though your reading app may let you swap them for its own.

Kindle is a trademark of Amazon.com, Inc. epubwise is not affiliated with Amazon.