Fade audio in and out

The job

A recording that starts cold or ends with a click needs gain ramps at the edges. Linear fades are predictable; equal-power fades sound more natural because perceived loudness is logarithmic.

Fade

Choose the file, set fade-in and fade-out seconds, pick the curve, and export. The tool decodes with Web Audio, applies the gain ramp to every channel, and writes uncompressed 16-bit WAV.

• 0.5–2 s is a typical music fade; speech can take as little as 0.1 s.
• In + out must fit inside the clip — a 3 s file cannot take 2 s at both ends.

Worked example

A 90-second voice note with a 0.3 s equal-power fade-in and a 1.5 s fade-out loses its pop at the start and its abrupt stop at the end.

Where it stops

Fades only — no crossfades, no level automation in the middle. Output is always WAV; files up to 200 MB that decode within a 256 MB PCM budget (about 12 min stereo at 44.1 kHz) load. The fade is permanent in the file — keep the original if you might want it back.