Here is the honest answer, stated upfront: you cannot upload a Kindle book to ReadLoud, or to any other outside tool, and have it read aloud. This is not a missing feature or a limitation specific to ReadLoud. It is how Kindle's DRM works, and it is worth understanding why, plus what you can actually do instead.
Why Kindle files cannot be converted
When you buy a book on Kindle, what you get is not a plain, portable EPUB. It is a file (AZW or the newer KFX format) wrapped in DRM, digital rights management, that locks it to Amazon's own reading apps and devices. This is a deliberate publisher and platform restriction, not a technical accident, and it exists specifically to prevent the file from being opened, read, or converted by software outside Amazon's ecosystem. That means no third-party app, ReadLoud included, can legally extract the text from a Kindle file to generate audio, because the file itself will not open outside the Kindle app in the first place.
Any tool or guide claiming to strip Kindle DRM and convert the resulting file is describing something that circumvents copyright protection, which is both legally risky and outside how ReadLoud, or any legitimate reading tool, operates. It is worth being skeptical of anything promising otherwise.
What actually works instead
1. Kindle's own read-aloud, where it exists
Some Kindle books include a built-in accessibility voice, and some titles are bundled with Audible narration through Amazon's own ecosystem, depending on the specific book, your device, and your region. This varies title by title and is not available for everything. If you own a Kindle book and want it read aloud, the first place to check is inside the Kindle app itself, since Amazon's own tools are the only ones with legal access to the protected file.
2. The same book, as a DRM-free EPUB you own
If you own a book on Kindle but the same title is also available DRM-free, directly from the publisher, from a DRM-free retailer, or as part of a bundle that includes an unprotected file, you can upload that separate DRM-free EPUB to ReadLoud like any other document. This is not converting the Kindle file, it is a different file entirely that happens to contain the same book. Whether this option exists depends entirely on the publisher and title, some publishers sell DRM-free editions, many do not.
Once you have a genuine DRM-free EPUB, the process is the same as any EPUB: upload it (up to 40 MB and 900,000 characters), the book's chapter structure is used so chapters stay distinct, and you pick a voice, press play, and go. See the EPUB to audiobook guide for the full walkthrough.
3. Public domain books, which are genuinely free and DRM-free
This is the most reliable option if the book you want happens to be old enough to be in the public domain, meaning its copyright has expired and it is legally free for anyone to use. Project Gutenberg and similar libraries offer tens of thousands of public domain books as free, DRM-free EPUB or plain text downloads, classic novels, historical texts, and more. Since there is no DRM involved at all, these download and upload cleanly, and you can go from "found on Project Gutenberg" to "listening" in a couple of minutes.
If you want to test how ReadLoud handles a whole book before spending any credits on something you already own elsewhere, a public domain title is a genuinely useful way to try it risk-free, since it costs nothing but your own reading time.
Once you have a DRM-free book, what listening actually looks like
Assuming you land on a genuine DRM-free EPUB, whether it is a publisher edition, a public domain classic, or your own writing, the process in ReadLoud is the same as any document: upload the file (up to 40 MB and 900,000 characters, more than enough for nearly any novel), pick from 30 voices across four engines, and press play. The Narrator engine, built on Google's Chirp 3 HD voices, is worth trying for fiction specifically, since it is tuned for audiobook-style narration rather than quick reference reading. The Gemini-based engines also support a delivery style, storyteller suits a novel, briefing or narrator suits nonfiction, and you can preview any voice before committing.
Progress is tracked automatically and resumes at the sentence you stopped at, synced across devices, and once a chapter has been generated it is cached, so going back to re-hear a passage costs nothing the second time. You can also download the finished book as a single MP3 for offline listening once it has fully generated.
What this means in practice
| You have | What you can do |
|---|---|
| A Kindle book with built-in Kindle read-aloud or Audible narration | Use that, inside the Kindle app or Audible |
| A Kindle book with no read-aloud available | Check if a DRM-free edition exists elsewhere for the same title |
| A public domain classic | Download the DRM-free EPUB from Project Gutenberg or similar, upload to ReadLoud |
| A DRM-free EPUB you already own, from any source | Upload directly to ReadLoud, this works normally |
| Only the Kindle file itself, no DRM-free version anywhere | No legitimate way to convert it, this is a real dead end |
That last row is the honest, sometimes disappointing truth. If a book only exists to you as a locked Kindle file and there is no DRM-free edition anywhere, there is no legitimate workaround, and it is better to know that clearly than to go looking for a tool that claims otherwise.
The bigger picture
DRM is frustrating precisely because it is invisible until you run into it. Most people do not think about which of their ebooks are locked until they try to do something like this and hit a wall. Buying DRM-free where it is offered, or knowing which of your favorite books are old enough to be public domain, are the practical ways around it, not a converter tool that promises to bypass a protection it cannot legally bypass.