Before you start: you need your source file, not the Kindle download
You cannot legally convert a .azw3 or .kfx file you bought (or even one you published) back into an audiobook source. Those files are DRM-wrapped and formatted for the Kindle reader, not for narration.
What you actually need is the manuscript you uploaded to KDP — the EPUB or DOCX. If you've lost it, KDP keeps the file you submitted: log in, open the title, and download the original from the Content tab.
Why not just put it on Audible?
Quick detour, because every author asks. Audible/ACX prohibits AI-narrated audiobooks unless they're produced through ACX's own internal tools. Submitting an AI-narrated file violates their terms and risks a takedown. We dig into the full picture in How to Make an Audible Book (and Why You Probably Shouldn't), but the short version: you can reach 50+ other retailers — Apple Books, Spotify, Kobo, Google Play, Storytel, Nextory, library systems — without that restriction, and that's where most non-Audible audiobook listening actually happens.
Step 1: Create a new project from your KDP manuscript
From the dashboard, open Projects → New. Drag in your EPUB or DOCX. Auto-chapter parsing will read your heading structure and split the book into sections you can narrate independently.
If chapters come in wrong (common with DOCX files that use bold text instead of real Heading 1 styles), you can merge or split sections after import. EPUB files almost always parse cleanly because the chapter breaks are encoded in the spine.
Step 2: Pick a narrator (or clone your own voice)
Browse the catalog of 54 curated voices. Filter by gender, accent, and Studio-eligibility, then click any voice to hear a 20-second sample reading from your actual book — not a generic demo. This matters: a voice that sounds great on a thriller can feel wrong on a cozy romance.
If you'd rather narrate it yourself without sitting in a booth for 40 hours, upload a 30-second clean recording of your own voice on the Voice Clone page. The clone becomes a private narrator only you can use.
Step 3: Narrate chapter-by-chapter or batch the whole book
Inside the project, you have two modes:
- Section-by-section — burn Instant Credits one chapter at a time. Best for your first project, because you can hear how the voice handles your style before committing to the whole manuscript.
- Whole Book batch (Studio plans) — queue every unnarrated section in one click. A typical 80,000-word novel finishes in 30–90 minutes depending on queue load.
Mark sections as Proofed as you listen back. The flag is just a tracking tool, but it keeps you honest on a long book — you'll forget what you've QA'd by chapter 22.
Step 4: Fix the rough spots with Quick Fix
AI narration nails 95%+ of a typical novel on the first pass. The other 5% is usually the same handful of issues: an unusual proper noun pronounced wrong, a sentence read too fast, an emotional beat that needs more weight.
Highlight the problem passage, click Quick Fix, and either re-roll the take or rewrite the source text (sometimes adding a comma is faster than re-narrating). You only spend credits on the regenerated audio, not the whole chapter.
Step 5: Export ACX-mastered MP3s or a single M4B
When the book is proofed end-to-end, export from the project page. Two options:
- MP3 ZIP — one file per chapter, mastered to ACX loudness specs (-18 to -23 LUFS, peaks under -3 dB). This is what every non-Audible retailer wants.
- M4B — single file with chapter markers and your cover art embedded. Best for direct sales, library uploads, and listeners who side-load.
Most authors export both. Storage is free; re-exporting later isn't.
Step 6: Distribute to retailers
To go wide, push the MP3 ZIP through SelfPublishing.pro from inside your project. They handle ingestion to Apple, Spotify, Kobo, Google Play, library aggregators, and 45+ other stores. You keep the rights and set your own price; royalties pay out monthly.
For a deeper walkthrough of the production side — pacing, voice selection, QA discipline — see How to Make an Audiobook: Complete Guide for Authors and the more general How to Turn a Book Into an Audiobook (Step-by-Step).
What it actually costs
A 60,000-word novel runs roughly 6–7 finished hours of audio. At Studio pricing ($49–$149/mo depending on tier), one full novel fits comfortably inside a single month's allotment. With one-time Instant Credit packs, you're typically in the $40–$120 range per book. Either way, that's an order of magnitude cheaper than hiring a human narrator (industry rate: $200–$400 per finished hour) — and you keep 100% of royalties instead of splitting.
