Most authors who produce an audiobook spend weeks on narration and mastering - then spend two confusing days figuring out how to get it onto Audible. This guide covers the full distribution chain: which platforms reach which buyers, the file specs each requires, how the AI narration disclosure works, and the one decision that will affect your royalties for seven years.
June 29, 2026 · 12 min read
Producing a retail-ready audiobook is a technical process - but so is getting it listed. Each major platform has its own upload portal, its own file specification, its own metadata requirements and, since 2024, its own AI narration disclosure workflow. First-time audio publishers often arrive at ACX with a finished master file and spend hours on questions that have clear answers once you know where to look.
The good news is that the process is consistent across platforms once you understand the structure. All major retail channels require the same basic inputs: per-chapter audio files mastered to a loudness standard, a retail cover image, product metadata, and an AI disclosure if your narration was generated rather than recorded. The differences are in the detail - and the detail is what this guide covers.
If you have not yet produced your audiobook, read our guide on how to make an audiobook first. If you are choosing between AI and human narration, the best AI voice generators for audiobooks guide covers what to look for. This guide starts where production ends.
Before submitting to any platform, decide whether you will distribute exclusively through Audible or wide across multiple retailers. This is the most consequential distribution decision you will make, and reversing it takes years.
ACX - Audio Creation Exchange, Audible's production and distribution platform - offers two royalty tiers:
| Option | Royalty (indicative) | Where your book sells | Exclusivity term |
|---|---|---|---|
| ACX exclusive | ~40% | Audible, Amazon, Kindle Unlimited only | 7 years from first sale |
| ACX non-exclusive | ~25% | Audible + Apple Books + Spotify + Kobo + your site | No exclusivity |
The royalty gap is 15 percentage points. But the exclusivity term runs seven years from the date of your first sale on Audible. An author who signs exclusive and later builds an audience on Apple Books or Spotify has no way to direct those buyers there until the window closes. Many authors with established email lists or social audiences choose non-exclusive to retain that flexibility from day one.
Neither option is universally better. Authors without an existing audience sometimes choose exclusive initially to concentrate launch energy on the largest single marketplace before widening. Authors with a backlist or an audience outside Amazon almost always choose non-exclusive. Make the decision deliberately - not by accident at the bottom of an upload form.
Three routes cover the majority of audiobook retail revenue for independent authors. Understanding what each one is and is not will tell you which combination suits your title.
The dominant English-language audiobook platform. Submit through acx.com. AI-narrated titles require a disclosure at upload. Technical review of your audio sample takes two to four weeks. Available in the US, UK, Germany and beyond. Start here regardless of your exclusivity choice.
Strong in the US, UK and Australia. Submit directly through the Apple Books for Authors portal or via an aggregator. Apple offers its own built-in narration tool as an alternative, but that option grants Apple rights to the resulting audio - avoid it if you produced independently and want to keep your files.
A single submission to Findaway Voices reaches Spotify, Kobo, Scribd, Libro.fm, OverDrive and others simultaneously. Aggregators charge a percentage of revenue or an annual flat fee. For most independent authors, an aggregator is the practical route to wide distribution beyond ACX and Apple.
Submitting a file outside spec delays your listing - sometimes by weeks while you remaster and resubmit. ACX in particular rejects files automatically if loudness falls outside the required window. Check these before you upload.
| Platform | Format | Bitrate | Loudness (RMS) | Peak ceiling | Room tone | AI disclosure |
|---|---|---|---|---|---|---|
| ACX (Audible) | MP3 CBR | 192 kbps | -23 to -18 dBFS | -3 dBTP | 5 sec head + tail | Required at upload |
| Apple Books | MP3 or M4A | 128+ kbps | Similar to ACX | -3 dBTP | Recommended | Required at upload |
| Findaway Voices | MP3 | 128+ kbps | Aggregator normalises | -3 dBTP | Per platform | Collected once |
ACX also requires a whole-book MP3 that combines all chapters, in addition to the per-chapter files. Each chapter file must be named consistently and submitted in order. Retail cover art must be at least 2400 x 2400 pixels, square, JPG or PNG.
The ACX loudness window (-23 to -18 dBFS RMS) is strict. Files measured even slightly outside that range fail technical review automatically. If you produced your audiobook with AudioBook Factory, every chapter file is already mastered to ACX spec - RMS, peak ceiling and room tone included - so you can upload directly without additional processing.
AudioBook Factory delivers per-chapter MP3 files pre-mastered to ACX spec. RMS, peak ceiling, room tone and the AI disclosure guide are included with every book. Try a free chapter before committing.
Since 2024, all major audiobook retailers require a disclosure when narration was generated with AI rather than recorded by a human narrator. Failure to disclose can result in delisting and account suspension.
A checkbox and written declaration in the upload form. The statement must confirm that narration was produced using AI voice synthesis. ACX may request additional documentation. The disclosure does not affect discoverability or the review timeline - it is a metadata requirement, not a content penalty.
A flag in the Books for Authors submission flow, plus a corresponding tag in the product metadata. Apple updated its content guidelines in late 2024 to require this explicitly. The disclosure appears in the product listing on Apple Books.
Findaway collects the AI narration declaration once during submission and forwards the information to each destination platform in the format that platform requires. You declare once; the aggregator handles the per-platform requirements. This is one practical advantage of aggregated distribution for AI-narrated titles.
The sequence below assumes your master files are ready. If you are still producing, read how to make an audiobook first.
Check that you have one MP3 per chapter, named sequentially (chapter-01.mp3, chapter-02.mp3...) plus a whole-book file. Run a loudness check: RMS must sit between -23 and -18 dBFS, peak ceiling at -3 dBTP. Confirm 5 seconds of room tone at the head and tail of every chapter file. Have your retail cover ready at 2400 x 2400 pixels minimum. Fixing these before you start an upload is faster than fixing them mid-submission.
Go to acx.com and create or log in to your account. Search for your book's ASIN (your eBook edition must already be listed on Amazon), claim the title and complete the metadata form. Upload your 15-minute audio sample - ACX reviews this first for technical compliance. Once the sample passes, upload the full chapter set and the whole-book file. Complete the AI narration disclosure if applicable. Set your royalty option (exclusive or non-exclusive). ACX review of the full submission typically takes two to four weeks.
If you chose non-exclusive on ACX, log in to the Apple Books for Authors portal (authors.apple.com). Enter your book metadata, upload your chapter files and cover, and set the AI narration flag in the submission form. Apple processes submissions in a few days to a few weeks. Apple's direct submission does not require a sample review - you submit the full book upfront. Your book becomes available on the Apple Books store, not through Audible or Amazon.
Log in to Findaway Voices (or your preferred aggregator). Create a new title, upload your metadata, chapter files and cover once. Select your destination stores - Spotify, Kobo, Scribd, Libro.fm and OverDrive are typically available in a single submission. Set pricing per market. The aggregator normalises files for each platform's technical requirements and handles AI disclosure forwarding. This single submission is your route to Spotify, where direct submission is not available to independent publishers.
Selling your audiobook directly from your author site via Payhip or Gumroad keeps 95 percent or more of the revenue and builds a direct customer relationship. It works best when you already have an email list or an audience driving traffic. Link from your eBook product page on Amazon, from your author bio and from any podcast feed you run. For authors distributing chapters as a free podcast to build an audience before the full sale, AudioBook Factory's AI podcast generator creates a podcast feed from the same production run that generates the audiobook.
The numbers below are indicative rates based on standard terms as of mid-2026. Platform policies change - check current terms before you submit.
| Platform | Royalty (indicative) | Notes |
|---|---|---|
| Audible - ACX exclusive | ~40% | 7-year exclusivity from first sale |
| Audible - ACX non-exclusive | ~25% | Wide distribution allowed simultaneously |
| Apple Books (direct) | ~70% | You set the retail price |
| Google Play Books | ~52% | Submit via Google Play Books Partner Center |
| Findaway Voices destinations | Varies (~25-40%) | Aggregator takes a share before retailer royalty |
Apple's direct royalty rate looks high compared to ACX non-exclusive. But Audible has significantly more audiobook buyers than Apple Books in most English-speaking markets. The practical question is not which rate is highest, but which combination of platforms reaches your readers where they already buy audio. For most authors, the answer is ACX non-exclusive plus an aggregator for Apple, Spotify and Kobo.
AudioBook Factory produces the retail-ready master files and delivers an upload guide with every finished book. Studio voice starts at $129 per book and includes ACX-spec mastering, AI disclosure language and per-chapter MP3 files ready to submit. The $299 Standard tier adds advanced voice direction and multi-voice casting. Premium at $499 delivers actor-grade narration with full character casting for fiction.
What AudioBook Factory does not do is submit on your behalf - distribution accounts on ACX, Apple Books for Authors and Findaway Voices are tied to your author identity and your royalty payment details. The upload steps above are ones you complete in about an hour using the files and guide delivered with your book.
For authors converting a backlist of multiple titles, monthly plans from $29 reduce the per-book cost substantially. The same production run that generates your audiobook can also create a podcast feed and a YouTube video from the same manuscript - a distribution multiplier from a single workflow.
Through ACX (Audio Creation Exchange) at acx.com. Create an account, find your book's Amazon ASIN, claim the title and complete the metadata form. Upload a 15-minute audio sample for technical review first. Once the sample clears, upload the full chapter set and the whole-book MP3. ACX requires files at 192 kbps CBR, RMS between -23 and -18 dBFS, peak at -3 dBTP and 5 seconds of room tone per file. AI-narrated titles must include a written disclosure. Full review takes two to four weeks.
ACX exclusive sells your audiobook only on Audible, Amazon and Kindle Unlimited at approximately 40 percent royalties. Non-exclusive allows you to simultaneously sell on Apple Books, Spotify, Kobo and your own site at approximately 25 percent from Audible. The exclusivity term is seven years from your first sale date. Authors with an established audience outside Amazon typically choose non-exclusive from the start to avoid locking out buyers on other platforms.
Yes, since 2024. Audible via ACX, Apple Books and Spotify all require a disclosure when narration was generated with AI. On ACX the disclosure is a checkbox and written statement in the upload form. Apple Books collects it in the Books for Authors submission flow. Aggregators such as Findaway Voices gather the declaration once and forward it to each destination platform. AudioBook Factory includes the correctly worded disclosure language in the upload guide delivered with every finished book.
Spotify does not accept direct audiobook submissions from independent publishers as of mid-2026. Distribution to Spotify requires an approved aggregator such as Findaway Voices, which in the same submission also reaches Kobo, Scribd, Libro.fm and OverDrive. Most aggregators charge a percentage of revenue or a flat annual fee. For authors who chose non-exclusive on ACX, an aggregator is the standard route to wide distribution.
ACX requires one MP3 file per chapter encoded at 192 kbps constant bitrate, mono or stereo, plus a whole-book MP3 combining all chapters. Loudness must sit between -23 and -18 dBFS RMS with a peak ceiling no higher than -3 dBTP. Each file must begin and end with at least 5 seconds of room tone. Retail cover art at minimum 2400 x 2400 pixels is uploaded separately. Files outside the loudness window are rejected automatically during technical review. AudioBook Factory masters all output to these specifications by default.
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