Make your audiobooks
ACX-ready.
Automatically.
Start nowOpen on your computer
ChapterPass processes audio locally using your device's processor. Visit chapterpass.com on a laptop or desktop to start.
First file processed free, no account needed
Time spent on technical compliance
Every hour you spend mastering is an hour you're not recording your next book.
Your audio goes to our servers nowhere.
Everything runs in your browser.
NDA-safe by design.
No guesswork. No "try this and see."
Pure math, no AI, no surprises.
9 processing steps. You do one: drop the file.
Format, filter, gate, compress, limit, verify, export. All automatic.
Cost of audiobook technical compliance
First chapter free. Full report included.
Works on any computer. Nothing to set up.
How it works
Drop your chapters
Make sure your recording is clean, no artifacts.
Have a coffee
9 deterministic steps, just a few minutes per chapter.
Download
Read the compliance report, download, publish.
Drop your chapters
Make sure your recording is clean, no artifacts.
Have a coffee
9 deterministic steps, just a few minutes per chapter.
Download
Read the compliance report, download, publish.
Guides and resources
ACX Audio Requirements
Every spec ACX checks, what ChapterPass automates, and how to pass.
Findaway Voices Requirements
Technical specs for Findaway Voices and how they compare to ACX.
Complete ACX Technical Guide
RMS loudness, true peak, noise floor, format, and silence specs explained.
Fix Every ACX Rejection Issue
Why files get rejected and how to fix each failure type.
Audiobook Mastering Guide
Full mastering workflow from raw recording to platform-ready files.
Free Audiobook Quality Checker
Free tools to verify your files, and the one spec they all miss.
ACX submission, together
You handle
- Clean recording
- Consistent narration
- Opening & closing credits
- One chapter per file
- Human narration only
ChapterPass handles
- RMS level
- Peak limiting
- Noise floor
- Head & tail silence padding
- Format conversion
- Compliance report