How to use Audio Volume Booster and Normalizer

Load a supported WAV and choose sample-peak normalization or gain adjustment.
For normalization set Target sample peak; for gain mode set Requested gain.
Run the adjustment and review the reported applied gain and clipping cap.
Listen to the download at a safe playback volume before comparing it with the source.

Example: Audio Volume Booster and Normalizer

Set a known sample peak without measuring loudness.

You add

Source: a mono WAV whose maximum absolute sample is 0.5. Volume adjustment: Normalize sample peak; Target sample peak: -1 dBFS; Requested gain: 0.

You get

The peak becomes approximately 0.89125 before PCM16 quantization, using a gain of about 1.78250. The report identifies the applied gain.

Options

Volume adjustment: Normalize scales the observed peak toward a target. Gain mode applies an entered change in decibels, subject to the sample-range cap.
Target sample peak (dBFS): Zero dBFS reaches the full sample range. A negative target leaves sample headroom; it does not certify headroom for reconstructed true peaks.
Requested gain (dB): Positive values request amplification; negative values reduce level. The result reports when clipping prevention lowers the requested increase.

Supported inputs and limits

Supported RIFF PCM/float32 WAV only, mono/stereo, 8–96 kHz, within 128 MiB and 600 seconds. Export is 16-bit PCM WAV without original metadata. Sample-peak adjustment is not LUFS, true-peak measurement or perceived-loudness matching; silent inputs need explicit handling.

Where your input is processed

This tool processes your input in this browser. Your text and files are not uploaded to UseFreeTools. Check this tool's limits for anything it may save on your device.

Peak and loudness answer different questions

Sample peak is the largest stored sample magnitude. Perceived loudness also depends on frequency content and how sound changes over time. Two files with the same peak can sound very different. This tool does not calculate LUFS or reconstructed peaks between samples and should not be described as a programme loudness meter.

The clipping cap can reduce a requested boost

Gain mode caps an increase when the input peak would exceed the sample range. The applied gain can therefore be smaller than the value you entered. Silence has no peak to raise through normalization. Output uses 16-bit PCM and omits original tags, so retain a higher-precision source when subsequent editing is planned.

Questions about Audio Volume Booster and Normalizer

Is sample peak the same as perceived loudness?

No. Loudness also depends on content, duration and frequency.

Does this measure inter-sample true peaks?

No. It measures the supported decoded sample values.

What happens when requested gain would clip?

The page reports the applied gain and its clipping-prevention adjustment rather than silently clipping samples.

Project manager: Tony Hines · Content updated 4 October 2026 · Report a problem