Audioknife

Fade In & Fade Out Audio

Add a smooth fade in and fade out to any song or recording, free and right in your browser. Pick the seconds, hear it, download MP3 or WAV. No upload, no sign-up.

  • No upload
  • Free, no sign-up
  • No watermark
  • Works on phones

How to use the fade in & fade out

  1. Drop your song or recording on the box above, or tap to choose it.
  2. Set how many seconds the fade in and fade out should last. The preview updates right away.
  3. Press play to listen, switch to “Original” to compare, then tap “Apply fades & save” and download.

A fade makes a track start and end gently instead of cutting in or stopping abruptly. It is the quickest way to tidy a clip for a video, a podcast intro, a ringtone or a DJ set.

Frequently asked questions

How long should a fade be?

For songs, 2–5 seconds sounds natural. For a short clip or ringtone, 0.5–1 second is enough. For a slow ending, try 8–15 seconds.

Which fade shape should I pick?

Smooth (S-curve) sounds the most natural for music. Linear is even all the way. Fast start drops the volume quickly at first, which suits speech.

Can I fade only the start or only the end?

Yes. Set the other slider to 0 seconds.

Are my files uploaded?

No. Everything runs in your browser on your own device, so your audio never leaves it.

Is it free?

Yes. No sign-up, no watermark and no limits set by us. Very long files (over about an hour) may be too big for a phone’s memory.