ACX audio spec checker

Check an audiobook file against the ACX submission spec, free and directly in your browser. Drop in a chapter and see RMS level, peak and noise floor measured against the real thresholds, with a pass or fail on each one and a plain reading of what to fix. Nothing is uploaded, so it is safe to run on unreleased work.

브라우저에서
Drop a chapter file here, or choose one
WAV, MP3, M4A or OGG. Measured on your device, never uploaded.
파일 선택
브라우저에서 실행되며 업로드되지 않습니다. Vocast의 무료 도구입니다.

작동 방식

1
Add your file

Drop or choose a chapter file. It stays on your device.

2
Measure

Your browser measures RMS level, peak and noise floor.

3
Check

Each metric is checked against the ACX threshold and marked pass or fail.

4
Fix and recheck

Read the one line guide on anything that failed, fix it, then check again.

자주 묻는 질문

Three measurable ones: RMS level between -23 dB and -18 dB, peak at or below -3 dB, and a noise floor at or below -60 dB RMS. Human review items such as pronunciation are out of scope.

No. The file is decoded and measured in your browser and never leaves your device.

It means the file meets the measurable technical spec. ACX also reviews performance and consistency, which no tool can check for you.

Reduce the room noise at the source if you can, then run the file through the free noise remover and check again.

관련 도구

Noise analyzer
Measure the noise in a recording and see what kind of noise it is.
라우드니스
유튜브, 팟캐스트, 방송 기준에 맞추며, 라우드니스를 전후로 측정해 보여줍니다.
노이즈 제거
말소리는 깨끗하게 남기고 히스, 험, 룸 톤을 걷어냅니다. 결과를 A/B로 비교하고 내려받습니다.

Audiobook narration in your own voice

This is the free checker. To narrate whole chapters in a voice cloned from your own, fully local and one time, get Vocast for $49.

Vocast $49에 받기기능 보기