What does "Normalize" actually do?

It finds the loudest sample across the whole file and scales the entire file up so that peak sits just under full scale (98%) — the loudest part gets as loud as possible without clipping.

Will a custom percentage above 100% distort the audio?

Samples are clamped to the valid range to avoid harsh digital clipping, but pushing well past 100% will still audibly flatten loud peaks — start closer to 100% and adjust by ear.

Does this tool upload my audio anywhere?

No — volume adjustment happens entirely in your browser with the Web Audio API.

Audio Volume Adjuster

Normalize an audio file’s volume automatically, or set a custom percentage.

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Choose an audio file

Files never leave your device — this runs entirely in your browser. Output is WAV.

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How it works

1
Choose an audio file

Up to 100 MB.
2
Pick Normalize or a custom percentage

Normalize raises the loudest peak to just under full scale; custom applies your exact gain.
3
Download the result

Exported as a WAV file.

FAQ

What does "Normalize" actually do?: It finds the loudest sample across the whole file and scales the entire file up so that peak sits just under full scale (98%) — the loudest part gets as loud as possible without clipping.
Will a custom percentage above 100% distort the audio?: Samples are clamped to the valid range to avoid harsh digital clipping, but pushing well past 100% will still audibly flatten loud peaks — start closer to 100% and adjust by ear.
Does this tool upload my audio anywhere?: No — volume adjustment happens entirely in your browser with the Web Audio API.