Peak Audio Normalizer
Finds the largest absolute sample across all channels. For target dBFS t, target amplitude is 10^(t/20); every sample is multiplied by target amplitude / input peak.
About this peak audio normalizer
Scale decoded samples so the measured peak reaches the selected dBFS target, then export WAV.
How this tool works
Finds the largest absolute sample across all channels. For target dBFS t, target amplitude is 10^(t/20); every sample is multiplied by target amplitude / input peak.
- Download the example file and select it in the file input.
- Set the visible controls to: Target peak (dBFS) = -1
- Click “Process locally”.
- Download the result and inspect: czoa-audio-volume-normalizer.wav — PCM16; 48000 Hz; 2 channels; 72000 frames; peak ≈ 0.89125
Worked example
Scenario: Example file: /examples/audio-stereo.wav; Download the example file and select it in the file input. Set the visible controls to: Target peak (dBFS) = -1 Click “Process locally”. Download the result and inspect: czoa-audio-volume-normalizer.wav — PCM16; 48000 Hz; 2 channels; 72000 frames; peak ≈ 0.89125
Sample input:
Illustrative output:
Limits and verification
The allowed target is −20 to 0 dBFS. Silence has no usable normalization factor and is rejected. This measures sample peak, not LUFS or inter-sample true peak; WAV output is quantized to 16 bits.
Examples demonstrate an expected workflow; they do not prove every input or every branch of an external specification. Check important results with an independent source before using them for money, security, compliance, safety, or irreversible file changes.
Browser processing boundary
Tool input is processed by code running in the browser and is not intentionally sent to a CZOA processing API. The page can still request ordinary site assets, analytics, or advertising when those services are enabled. Browser extensions and managed-device software remain outside this tool's control.
Relevant references
These references govern or help explain the format, protocol, or calculation used here. Listing a reference does not claim certification or complete implementation of every optional feature.
- W3C Web Audio API 1.0 — browser decoding and offline rendering
- Microsoft RIFF/WAVE PCM and WAVEFORMATEXTENSIBLE
Content owner: CZOA Tools · Last reviewed: 2026-09-15 · Review methodology
How to use it
- Download the example file and select it in the file input.
- Set the visible controls to: Target peak (dBFS) = -1
- Click “Process locally”.
- Download the result and inspect: czoa-audio-volume-normalizer.wav — PCM16; 48000 Hz; 2 channels; 72000 frames; peak ≈ 0.89125
Frequently asked questions
How does Peak Audio Normalizer process the signal or file?+
Finds the largest absolute sample across all channels. For target dBFS t, target amplitude is 10^(t/20); every sample is multiplied by target amplitude / input peak.
How can I reproduce the Peak Audio Normalizer example?+
Example file: /examples/audio-stereo.wav; Download the example file and select it in the file input. Set the visible controls to: Target peak (dBFS) = -1 Click “Process locally”. Download the result and inspect: czoa-audio-volume-normalizer.wav — PCM16; 48000 Hz; 2 channels; 72000 frames; peak ≈ 0.89125
What limits apply to Peak Audio Normalizer?+
The allowed target is −20 to 0 dBFS. Silence has no usable normalization factor and is rejected. This measures sample peak, not LUFS or inter-sample true peak; WAV output is quantized to 16 bits.
What does browser-isolation evidence establish for Peak Audio Normalizer?+
Recorded browser requests contained no selected-audio payload while the fixture measured the output peak and downloaded WAV. It covers that tested-browser tool-value path only; ordinary page assets, extensions, and other network settings remain outside scope.