Is the fade linear or logarithmic?

Linear — volume ramps evenly from 0 to full (or full to 0) over the fade duration.

Can I add both a fade-in and a fade-out?

Apply one, download the result, then upload that file again and apply the other.

No — the fade is applied entirely in your browser with the Web Audio API.

Add a fade-in or fade-out to an audio file.

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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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1
Choose an audio file

Up to 100 MB.
2
Pick fade-in or fade-out and a duration

How many seconds the fade ramps over.
3
Download the result

Exported as a WAV file with a linear volume ramp applied.

Is the fade linear or logarithmic?: Linear — volume ramps evenly from 0 to full (or full to 0) over the fade duration.
Can I add both a fade-in and a fade-out?: Apply one, download the result, then upload that file again and apply the other.
Does this tool upload my audio anywhere?: No — the fade is applied entirely in your browser with the Web Audio API.