Master your complete audiobook without mastering audio engineering.
Engineered to the published technical requirements of ACX / Audible — the strictest of the major audiobook retailers
Upload your edited narration. ChapterMend repairs technical audio problems, matches every chapter and returns correctly formatted files with a complete plain-language report.
You bring
- Narration you already recorded and edited
- Your music intros and outros, mixed the way you want them
- One file per chapter, in any common format
- Nothing else — no plugins, no settings
ChapterMend handles
- Pops, hiss, hum and room-tone repair
- Levels, peaks and noise floor to submission spec
- Music intros and outros left as you mixed them
- Spacing, MP3 formatting and an honest fault report
Three steps, and none of them are audio engineering.
Upload your edited chapters
WAV, MP3 or FLAC. One file per chapter.
ChapterMend diagnoses and repairs
It fixes safe technical problems and flags anything that should be re-recorded.
Download the complete package
Receive mastered chapters, organized delivery files and a plain-language report.
See what ChapterMend detects and repairs.
Defects are located first, then repaired only where repairing them will not hurt the performance.
ChapterMend reads your book the way a producer does.
Every chapter is checked, repaired where it is safe, and honestly flagged where it is not — with exact timestamps for anything that needs re-recording. You always know where your book stands. The chapters below illustrate the format of that report.
Every measurement, explained in plain language.
The same numbers a mastering engineer checks — with a verdict you can act on, not jargon. The figures below are an example of the report format, not a customer’s book.
The fixes engineers charge by the hour for.
You send a finished recording — narration, music beds and all. ChapterMend repairs and masters it. It never generates narration, and it leaves your mix where you put it.
Plosive repair, noise reduction, levels, peaks, room tone, chapter matching and MP3 formatting all run in the automated chain today, and every book comes back with a report naming what we fixed — and what we could not. Complete-book packaging and delivery are in testing: exactly what the founding beta is for.
Hear it before you pay
After the free scan we master a 30-second excerpt of your audio, through the same process your finished book gets. Listen first.
Plosive (pop) repair
Popping “p” and “b” blasts softened by ducking only the low frequencies that carry them — your narration is left untouched.
Hum & rumble reduction
Mains hum, air conditioning and handling rumble filtered out below the voice, and measured so you know it was there.
Noise reduction
Hiss and room noise lowered conservatively — never the smeared “underwater” sound.
Consistent chapter volume
Chapter 12 sounds like Chapter 1, even if they were recorded weeks apart.
Room-tone correction
Natural silence at the head and tail of every chapter, taken from your own room.
Correct MP3 export
192 kbps CBR, 44.1 kHz, metadata stripped, encoded once from a lossless master.
Honest fault report
Pops, rumble and room echo are measured and reported by chapter — including the ones we tell you plainly we cannot repair.
Complete-book packaging
Chapters named in running order, opening and closing credits placed, retail sample kept separate, zipped with your report.
Your audio is used to process your book and nothing else: it is never used to train models, and files are deleted automatically 48 hours after delivery. The Privacy Policy sets out exactly how files are handled and when they are deleted.
One book, one price, reviewed personally.
A small first group of books, each one checked by Joel before it goes back to you.
- Complete-book technical diagnosis
- Safe audio repair and mastering
- Chapter-to-chapter consistency check
- Plain-language technical report
- Retail-ready file packaging
- Founder quality review
- Automatic deletion after delivery
Have a longer book? Contact us for a custom pilot quote.
What ChapterMend does, and what it doesn’t.
Does ChapterMend replace audiobook editing?
No. ChapterMend starts where your edit ends. You edit the performance — retakes, pacing, breaths you want gone — and ChapterMend handles the technical layer on top: repair, levels, spacing, formatting and verification across the whole book.
What problems can ChapterMend repair?
Loudness and peak levels, a noise floor that is too high, popping “p” and “b” sounds, low-frequency hum and handling rumble, missing or wrong head and tail room tone, inconsistent volume between chapters recorded on different days, wrong sample rate or bitrate, and mixed mono/stereo files. Every book also comes back with a report naming what we repaired and what we could not.
What problems require re-recording?
Heavy clipping, strong room echo, and misreads or missing text. Software can disguise these, but it damages the narration doing it. ChapterMend measures clipping and room echo and reports them by chapter, and tells you plainly that a re-record will beat any processing — rather than quietly making the audio worse. Misreads and missing text are not something measurement can find; those are caught in the founder review of every founding-beta book.
Does ChapterMend guarantee retailer approval?
No, and be wary of anyone who does. ChapterMend verifies the measurable technical requirements. Retailers also run human review that judges performance, pacing and manuscript accuracy — things no mastering tool can pass on your behalf. ChapterMend is independent and not affiliated with ACX, Audible or Amazon.
What happens to my audio after processing?
It is used to process your book and nothing else. Delivered books are deleted automatically 48 hours after delivery, and uploads that are never completed are deleted on the same clock. The Privacy Policy sets out the full detail, including what we keep afterwards and for how long.
Does ChapterMend generate or clone voices?
No. ChapterMend never generates speech and never clones a voice, and your audio is never used to train models. Whatever you send comes back as the same performance — repaired, levelled and correctly formatted.
My chapters have music at the start and end. Is that a problem?
No. Intro and outro music beds are normal in audiobooks and ChapterMend masters the file as delivered — your music stays where you put it, at the balance you chose. Worth knowing: retailers measure the whole file, so a music bed that is much louder or quieter than the narration can pull the file’s overall levels around, and music running under a fade is not silence. If that affects your measurements, the report tells you which chapter and where, rather than quietly re-balancing your mix.
“Every rule ChapterMend enforces comes from audiobooks that actually shipped — including the painful lessons.”