Analyze audio

How audio moderation works, supported formats, limits, and transcription quality settings.

Audio moderation is available to customers on custom plans. If you’re interested in using audio moderation, please reach out here.

How it works

Audio files are automatically transcribed to text using speech recognition, then the transcript is analyzed by all enabled text-based policies. This means any policy that works on text (toxicity, hate, PII, wordlists, guidelines, etc.) also works on audio with zero additional configuration.

const result = await moderationApi.content.submit({
  content: {
    type: "audio",
    url: "https://example.com/audio.mp3",
  },
});

Supported audio formats

Any format FFmpeg can decode is supported. All audio is internally converted to 16 kHz mono WAV before transcription.

Format	Extensions
MP3	.mp3
WAV	.wav
AAC	.aac, .m4a
OGG	.ogg, .oga
Opus	.opus
FLAC	.flac
WebM	.webm
AMR	.amr
WMA	.wma
MP4	.mp4, .m4a, .mov

Limits

Constraint	Value
Max file size	50 MB
Max audio duration	10 minutes
Processing timeout	30 seconds
URL schemes	http, https only
Private/internal IPs	Blocked (SSRF protection)

Transcription quality

You can configure transcription quality per channel in the dashboard under Content > Audio > Transcription quality.

Setting	Label	Use case	Relative speed
SPEED (default)	Fast	Real-time moderation, high volume	Fastest
BALANCED	Balanced	General purpose, good accuracy	~2x slower
ACCURACY	Accurate	Noisy audio, critical content review	~3x slower

Usage and billing

Each audio moderation request costs 2 units: 1 for transcription + 1 for policy analysis.