Fade in / out
Set total duration so the fade-out lands at the right time.
About this tool
Add a smooth fade-in at the beginning and/or fade-out at the end of an audio file. Removes the abrupt clicks at the start of recordings and the harsh cut-offs at the end, giving voice memos, music demos and podcast intros a professional finish in seconds.
Privvert lets you set independent fade-in and fade-out durations in seconds. Fades use a linear curve by default, with an optional logarithmic curve for music. Stream-copy is preserved for the unchanged middle of the file when possible, so processing is fast.
Features
- Independent fade-in and fade-out durations (in seconds, decimals OK)
- Linear (default) or logarithmic fade curves
- Reads any common audio format
- Outputs MP3 at 192 kbps
- Browser-only, instant processing for short files
- No signup, no watermark, no upload
- Logarithmic fade curve matches what the ear hears as linear
How to use it
- Drop in your audio file.
- Set the fade-in seconds (0 to disable).
- Set the fade-out seconds (0 to disable).
- Click Apply and the faded file downloads.
Everything happens inside your browser using JavaScript and WebAssembly. Your files are never uploaded to a server, never stored, and never seen by us.
Frequently asked questions
Yes - set the duration on the side you don't want faded to 0.
0.05-0.2 seconds is enough to remove a click. 1-3 seconds is a typical music fade. 5+ seconds for a slow ambient ending.
No - fades only adjust the volume curve at the edges. Use the silence-removal tool to trim leading/trailing silence.
Output is MP3 at 192 kbps regardless of input, so the file plays everywhere.
Human hearing is roughly logarithmic, so a mathematically linear amplitude fade sounds like it stays the same volume and then suddenly drops. The default fade curve is logarithmic for that reason; you can switch to linear if you specifically need it.
For songs, 2-4 seconds at the end is conventional. For voice recordings or podcasts, 0.5-1 second on the intro and outro is usually enough to avoid clicks without sounding faded.