The short answer
An AAX file is an Audible audiobook with protected audio: an MPEG-4 audiobook, like an M4B, whose sound is encrypted for your account.9 It plays in Audible’s apps, its browser Cloud Player and the few devices Audible supports, and nowhere else.1,3,4 Converting it means removing that protection, which Audible’s terms forbid and copyright law restricts,10,11 so this guide sticks to what you can do: listen on every device you own, and buy DRM-free when you want files of your own.
- What AAX is
- Audible’s locked audiobook file
- Plays in
- Audible’s own players
- On Windows
- Browser or AudibleSync
- Want files you own?
- Buy DRM-free
What AAX, AA and AAXC files are
Audible has used a few protected formats over the years. Its own help pages no longer name them, so this part comes from secondary sources:9
- .aax, “Audible Enhanced Audio”: an encrypted M4B. AAC audio in an MPEG-4 container, mostly 64 kbps at 22.05 kHz; radio plays and some German titles at 128 kbps and 44.1 kHz.
- .aa, the older formats: “Format 4” at 32 kbps (MP3 audio, mono), and lower-quality Formats 2 and 3, all with the same account lock.
- .aaxc: an encrypted audiobook downloaded by Audible’s Android and iOS apps, which other players can’t open.21
Today Audible’s apps simply offer “Standard” or “High” download quality in their settings.8 The audio inside is encrypted; the tags around it (title, author, cover) usually aren’t, which is why a file can show its cover in a folder and still refuse to play.
Where your Audible files come from now
- The Audible app on a phone, tablet, Mac or Kindle downloads titles for offline listening, one at a time, kept inside the app.2
- AudibleSync, on Windows 10 or 11, downloads titles to the computer, but “can only be played by transferring them to a compatible MP3 player or accessibility device.”4
- The Audible website: Apple’s Books guide still describes playing an audiobook downloaded from audible.com in Books on a Mac.7 Audible’s own help now sends Mac listeners to its macOS app instead.2,5
Only titles bought with a credit or a card can be downloaded to a computer; titles from a plan’s included catalogue stay in the apps.2
How to listen to Audible books on every device
| How | Offline | |
|---|---|---|
| iPhone and iPad | Audible app (iOS 18 or later) | Yes |
| Android | Audible app (Android 9 or later) | Yes |
| Mac | Audible app (macOS 15 or later, M1 or later); or Books with an authorised Mac; or the Cloud Player | In the app or Books |
| Windows PC | Cloud Player in Chrome, Edge, Firefox or Safari; no Windows app | No |
| Chromebook, Linux | Cloud Player in a browser | No |
| Kindle | Kindle 10th generation or later, Kindle Scribe, Kindle Colorsoft | Yes |
| Alexa and Echo | On your Alexa and Echo devices | No |
| MP3 player | AudibleSync (Windows 10 or 11) to SanDisk Clip Jam, Clip Sport Plus or Clip Sport Go | Yes |
| Accessibility player | AudibleSync to Bones Milestone 212/312 or Victor Reader Stream 2/3 | Yes |
“There’s no Audible app for PC”, Audible says, and its Android app stopped being available on Windows 11 when Microsoft closed the Amazon Appstore there in March 2024.3,6 The Cloud Player keeps your place across devices, but needs a connection.3
Can you convert AAX to MP3?
Not without removing the protection, and that is where the law comes in. We are not lawyers, and this is not legal advice, but the rules are short enough to quote:
- Audible’s terms: you may not “attempt to disable, bypass, modify, defeat, or otherwise circumvent any digital rights management or other protection system applied to Content”.10
- United States: “No person shall circumvent a technological measure that effectively controls access to a work protected under this title” (17 U.S.C. § 1201). The Copyright Office reviews narrow exemptions every three years.11,12
- European Union: member states must give “adequate legal protection against the circumvention of any effective technological measures” (Directive 2001/29/EC, Article 6).13
- United Kingdom: section 296ZA of the Copyright, Designs and Patents Act gives rights holders action against anyone who knowingly circumvents effective technological measures.14
Buying the book doesn’t change this: Audible’s terms say that when you buy, “you are purchasing a license”, subject to those restrictions.10 So this site doesn’t remove DRM, and doesn’t name or link the tools that do. If you want files you can convert, split, edit or play anywhere, the honest route is to buy them DRM-free.
Where to buy audiobooks without DRM
| What you get | Catch | |
|---|---|---|
| Libro.fm | DRM-free MP3s (zipped) or one M4B per book, plus apps and a web player | Smaller catalogue than Audible; sales support independent bookshops |
| Downpour | “Much of” its catalogue DRM-free | Some titles are DRM-protected and play only in Downpour’s apps |
| Google Play Books | Export from your library on a computer | Only if the publisher allows; check the book’s page |
| An author’s own shop | Often through BookFunnel, which can deliver DRM-free MP3s | Only if the author turns downloads on |
| LibriVox | Free public-domain audiobooks as MP3 and, for most, M4B | Volunteer readers; old books only |
| Your library (Libby) | Some cards can download MP3 audiobooks | To be deleted when the loan ends |
Libro.fm’s files come as zipped MP3s or a single M4B, which you import into any player; it partners with over 5,000 independent bookstores.15,22 Downpour says much of its content is DRM-free, but “select products … are required by publishers to have DRM protected files”, playable only in its apps.16 LibriVox’s recordings are public domain.17 Google Play lets you export an audiobook when the publisher allows it.18 BookFunnel lets authors offer “optionally DRM-free MP3 downloads”.19 Some library cards in Libby can download MP3 audiobooks for the length of the loan.20 More free options are in free audiobooks.
What our tools do with your files
Every tool here runs in your browser and never uploads a file. They recognise Audible’s protected files, by name and by what’s inside, and say so without changing them. With DRM-free files they do everything:
- Play MP3s and M4Bs with chapters, speed, a sleep timer and your place remembered, offline once installed.
- Turn a folder of MP3s into one M4B with chapters, or an M4B into MP3s for an older player or a car.
- Edit chapters, fix the title, author and cover, shrink a big file.
For the formats themselves, see what an M4B file is and audiobook formats by store; for keeping your Audible books after cancelling, Audible credits explained.