Last updated: 2026-07-29
Drop your AZW3 or MOBI file here
Free, no account, no upload — the file is converted inside this browser tab and never leaves your device.
Supports .azw3 · .azw · .mobi · .prc · DRM-free books only
Kindle books are stored in Amazon's own formats — AZW3 and the older MOBI — which almost nothing outside a Kindle will open. EPUB is the open standard the rest of the reading world uses: Apple Books, Kobo, Calibre, Thorium, Google Play Books, and every tool built on top of them. This converter turns one into the other, for free, without an account, and without the book ever leaving your computer.
Drop the file into the box above, or click it to browse. Kindle books usually
live in Documents on the device itself, or in the My Kindle Content folder
if you have used the desktop app. .azw3, .azw, .mobi and .prc all work.
The conversion runs in this browser tab. Nothing is uploaded, nothing is queued on a server, and a typical novel takes well under a second. If the book is protected by DRM you will get a plain explanation instead of a file — see below for why.
You get back a standard EPUB: chapters as separate documents, the table of contents rebuilt, the cover and illustrations carried over, and the original stylesheets preserved. Open it in any reader, or send it back to your Kindle — modern Kindles accept EPUB directly.
Most books bought from the Kindle Store are locked with Amazon's DRM. This tool does not remove DRM, and that is a deliberate choice rather than a missing feature. Stripping the protection from a book you licensed is a legal problem in most countries, and we are not going to build a tool that does it or ship a dependency that can.
What that leaves is a large and perfectly ordinary set of books:
If you upload a protected file, the converter reads the encryption flag in the book's header, stops there, and tells you what it found. It never attempts to decrypt anything.
A Kindle book is not a zip of HTML files the way an EPUB is. Both AZW3 and MOBI are Palm databases: a header, then a run of compressed records. Converting is therefore closer to reconstruction than to renaming.
For a modern AZW3 (internally called KF8) the book text is stored as one
continuous blob, plus two indexes that describe how to cut it back up — a
skeleton per chapter holding the document shell, and a series of chunks that
belong inside it at recorded offsets. Concatenating that blob without following
the indexes puts the text outside the <body> tag, which is why some converters
hand back a single unreadable file. This one follows the indexes, splices each
chapter back together, resolves Kindle's internal kindle:pos links into real
anchors, extracts the images and stylesheets, and rebuilds the navigation from
the book's own table of contents.
Older MOBI files are a single HTML document separated by page-break markers, with images addressed by record number and links addressed by raw byte offset. Those get split at the page breaks, with every internal link converted into a proper anchor.
The result is a valid EPUB 3 with an EPUB 2 navigation fallback, so old readers and new ones both open it.
| Extension | What it is | Converts here |
|---|---|---|
.azw3 | KF8, the modern Kindle format | Yes, if DRM-free |
.azw | Usually a MOBI in Kindle packaging | Yes, if DRM-free |
.mobi | The original Mobipocket format | Yes |
.prc | Mobipocket under an older extension | Yes |
.kfx | Amazon's newest format, always protected | No |
.epub | Already the open standard | No conversion needed |
If your file is .kfx, there is no DRM-free version of it to convert — the
format was introduced alongside stronger protection and is not something we
support.
Converting to EPUB is often not the real goal. Frequently the reason someone wants a Kindle book out of Amazon's format is that they want to do something with it, and the most common something is reading it in a language they actually speak.
That is what the rest of this site is for. Once your book is an EPUB, our book translator rewrites the whole thing — every chapter, footnote and heading — into any of 16 languages, and hands back a normal EPUB with the layout intact. It is not a browser overlay and not a chapter-at-a-time copy-paste job: you get a finished book file you own. If you converted a book here, we carry the file straight over so you do not have to select it twice.
Worth reading next: how the translation works, which languages are supported, and why this beats pasting chapters into an LLM.
Yes, and there is no account, no watermark and no file limit beyond what your browser can hold in memory. It costs us nothing to run because the conversion happens on your machine rather than on our servers.
No. The file is read, converted and written back out inside this browser tab. Nothing is sent to us, which is also why the converter keeps working if you go offline after the page has loaded.
No. We detect DRM so we can explain why a file will not convert, and we stop there. Removing protection from a licensed book is not something this tool does or will do.
Yes. Chapters come out as separate documents, the cover and inline images are extracted, the original stylesheets are carried over, and the navigation is rebuilt from the book's own table of contents rather than guessed from file names.
Yes. Amazon's Send to Kindle has accepted EPUB since 2022, so you can email or upload the converted file straight back to your device. That is also how you get a translated version onto a Kindle.
Neither is technically better — they are close cousins, and AZW3 was in fact built on top of the same HTML and CSS that EPUB uses. EPUB is simply the one that is not tied to a single company's devices, so it is the safer format to keep a library in.