Do I need to install anything to use this tool?

This tool generates the command for you — no installation needed here. To run the actual conversion you need Calibre (free, open-source) installed on your computer. Download it from calibre-ebook.com. The ebook-convert program ships with every Calibre installation.

What is AZW3 and why convert it to EPUB?

AZW3 (also called Kindle Format 8 or KF8) is Amazon's proprietary ebook format, readable only on Kindle devices and the Kindle app. EPUB is the open ISO standard supported by virtually every non-Amazon reading platform — Kobo, Apple Books, Google Play Books, Adobe Digital Editions, and more. Converting to EPUB frees your books from the Kindle ecosystem.

Will my AZW3 file be uploaded anywhere?

No. The file inspector reads only the name and size from your local file system using the browser's File API — no data leaves your device. The command generator also runs entirely in your browser. Your ebook content is never transmitted to any server.

Can I convert DRM-protected AZW3 files?

No. Calibre cannot convert AZW3 files that have Amazon DRM applied. Only DRM-free AZW3 files can be converted — this includes personal documents sent to your Kindle, ebooks purchased from DRM-free stores, and self-published works you own the source files for. Stripping DRM is illegal in most jurisdictions.

What EPUB version does Calibre output?

By default Calibre outputs EPUB 2. You can force EPUB 3 output by adding the --epub-version 3 flag manually to the generated command. EPUB 3 supports more advanced layout features but EPUB 2 has broader compatibility with older reading devices.

Why does my converted EPUB look different from the Kindle original?

AZW3 uses proprietary Kindle-specific CSS extensions. Calibre translates these to standard CSS, but some layout differences (fonts, column layouts, complex tables) are expected. Re-editing the EPUB in Sigil after conversion usually fixes cosmetic issues.

Can I batch-convert multiple AZW3 files at once?

Yes. The tool shows bash and PowerShell batch loops after generating a command. On Linux/macOS: for f in *.azw3; do ebook-convert "$f" "${f%.azw3}.epub"; done. Each file is processed sequentially by Calibre.

AZW3 to EPUB Calibre Command Generator

Generate a ready-to-run Calibre ebook-convert command to convert AZW3 Kindle ebooks to EPUB, and inspect your local AZW3 file details without uploading anything.

Conversion Settings

Drop your AZW3 file here

or click to select — file is not uploaded

Files

Input AZW3 file *

Filename or full path, e.g. /home/user/books/my-book.azw3

Output EPUB file

Leave blank to auto-derive from input filename.

Metadata overrides (optional)

Book title

Author

Publisher

Language

Cover image path

EPUB version

Fill in settings and click Generate Command

Your ready-to-run Calibre command will appear here.

How to Install Calibre

Windows

Download the installer from calibre-ebook.com, run it, then open a Command Prompt and type ebook-convert --version to verify.

macOS

Download the .dmg from calibre-ebook.com or run brew install --cask calibre if you use Homebrew.

Linux

Run sudo apt install calibre on Debian/Ubuntu, sudo dnf install calibre on Fedora, or use the official binary installer script from calibre-ebook.com.

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Summary

Generate a ready-to-run Calibre ebook-convert command to convert AZW3 Kindle ebooks to EPUB, and inspect your local AZW3 file details without uploading anything.

How it works

Optionally drop or select your AZW3 file to inspect its name and size (nothing is uploaded).
Enter the AZW3 filename or full path in the input field.
Optionally override the output EPUB filename (defaults to the same name with .epub extension).
Fill in any metadata overrides: title, author, publisher, language, or cover image path.
Click "Generate Command" to see the full Calibre ebook-convert command.
Paste the command into your terminal (macOS, Linux, or Windows with Calibre installed) and run it.

Use cases

Converting Kindle AZW3 ebooks to EPUB to read on Kobo, Apple Books, or any non-Kindle device.
Unlocking personal DRM-free Kindle ebooks for use in reading apps that do not support AZW3.
Embedding updated metadata (title, author, cover) into EPUB files before sideloading.
Batch-converting an AZW3 library to EPUB using the generated shell loop commands.
Archiving ebooks in EPUB format, the open ISO standard with the longest-term compatibility.
Preparing ebooks for editing in Sigil or similar EPUB editors by converting from AZW3 first.
Generating Calibre commands without memorizing all available flags and options.
Verifying your file is actually an AZW3 before attempting conversion (via the file inspector).

Frequently Asked Questions

Last updated: 2026-09-14 · Reviewed by Nham Vu