Fade audio in and out — free online tool
Add a linear fade-in and fade-out of 0.1 s or longer to any audio file; the fade-out start is calculated from the file length.
What to know
Fade uses one duration for both ends. You type a number of seconds in the Fade duration field, at least 0.1 and never longer than the clip, and the tool ramps the volume up from silence at the start and down to silence at the end by that same amount.
The fade-in begins at 0 seconds. The fade-out begins at the file length minus the fade duration, so a 3-minute track with a 2-second fade starts fading out at 178 seconds. If the tool cannot read the length of the file, it asks for a fade-out start point instead.
The ramp is the linear default of the ffmpeg afade filter, which means volume changes at a constant rate rather than following a curve. That suits short fades of 0.5 to 3 seconds, which are enough to remove clicks at cut points or soften the start of a loop.
Keep the duration under half the clip length. At 10 seconds long, a 6-second fade would have the fade-in and fade-out overlapping in the middle, and the audio would never reach full level.
Fade belongs last in a chain. If you trim after fading, the fade-out at the old end is cut away, so trim first, fade second, and export the final file as MP3 or M4A.
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How to use Fade audio in and out — free online tool
- Load song.mp3 and open the Fade effect.
- Type 2 in Fade duration (seconds); this adds a 2-second fade-in and a 2-second fade-out.
- Pick MP3 at 192 kbps for the export.
- Process, listen to the first and last few seconds in the preview, and download song-fade.mp3.
Quick answers
Can the fade-in and fade-out have different lengths?
No. One Fade duration value is applied to both ends.
When does the fade-out start on a 3-minute file with a 2-second fade?
At 178 seconds, which is the file length of 180 seconds minus the fade duration.
What is the smallest fade I can set?
0.1 seconds, which is short enough to remove a click without being heard as a fade.
Is the fade linear or logarithmic?
Linear. Volume changes by the same amount each moment between silence and full level.