Audio fade in/out

Add linear or equal-power fades to the start and end of an audio file, then download a WAV.

Decoded, faded, and re-encoded in this browser. Nothing is sent anywhere.

Decodes with the browser's Web Audio decoders and exports uncompressed 16-bit WAV. Files up to 200 MB that decode within a 256 MB PCM budget (about 12 min stereo at 44.1 kHz); each fade up to 10 minutes, and in + out must fit inside the clip.

How to use

  1. Choose an audio file.
  2. Set fade-in and fade-out seconds and the curve.
  3. Apply and download the WAV.

What it supports

Decodes whatever the browser's Web Audio supports and exports 16-bit WAV only. Source files up to 200 MB that decode within a 256 MB PCM budget (about 12 min of stereo at 44.1 kHz). Each fade 0–600 s, and in + out must fit the clip's length. No lossy re-encode — output is always uncompressed.

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