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Audio Checker & Fixer

Check a file against audiobook specs, and fix it if it fails.

Retailers reject audiobook files for technical reasons: too quiet, peaks too hot, the wrong sample rate, not enough room tone. The Audio Checker measures your file against our specs, which follow the standards stores use, and shows a pass or fail with the actual number for each one. If a file fails, one click formats it to spec for you to download.

See it in action

What it looks like

A real check: every spec with its measured value. This file failed one check, room tone at the end, because we cut it off mid-chapter for the example.
A real check: every spec with its measured value. This file failed one check, room tone at the end, because we cut it off mid-chapter for the example.
One click on "Format to spec for me" and the results switch to the fixed file: every check passes, ready to download.
One click on "Format to spec for me" and the results switch to the fixed file: every check passes, ready to download.
How it works

How the Audio Checker & Fixer works

  1. Upload an MP3, WAV or M4A file.
  2. See every check, pass or fail, with the measured value.
  3. If it fails, click "Format to spec for me" and download the fixed file.
What you get

What the Audio Checker & Fixer does

  • Checks format, bitrate, sample rate, channels, length, loudness, peaks, noise floor and room tone.
  • Fixes format, levels and room tone: converts to mono 44.1 kHz MP3, sets loudness, keeps peaks safe and adds clean room tone at the start and end.
  • Re-checks the fixed file before you download it.
  • Honest about limits: it can't remove background noise that is in the recording itself.
The details

Specs and price

FormatMP3, at least 192 kbps, 44.1 kHz, mono
Length75 minutes or less per file
Loudness (RMS)-23 to -18 dB
Peak level-3 dB or lower
Noise floor-60 dB or lower
Room tone0.5 to 1 second at the start, 1 to 5 seconds at the end
PriceFree for every narrator and author with an Academy Voices account.

Checked October 2026. See every fee on our facts page.

Questions

Questions about the Audio Checker & Fixer

What are audiobook file requirements?

For Academy Voices: MP3 at 192 kbps or higher, 44.1 kHz, mono, 75 minutes or less per file, loudness between -23 and -18 dB, peaks at -3 dB or lower, a noise floor of -60 dB or lower, and room tone at the start and end.

Can it fix background noise?

No. It fixes format, levels and room tone, but noise in the recording has to be dealt with in your edit.

Does checking a file submit it?

No. The checker is only a test. Nothing is attached to a project.

Is it really free?

Yes, for anyone with a narrator or author account.

Create a free account

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