Smooth the start and end of a clip with a fade in and fade out — set each duration independently, with a choice of linear or equal-power (smoother-sounding) curve.
The Audio Fader adds a smooth fade-in at the start and fade-out at the end of a recording. Fades hide abrupt starts and stops, give a track a polished ending, and are essential for ringtones, intros, podcasts and video voice-overs.
Five curve shapes are available because the shape matters: linear is simple but can sound like it drops off quickly at the end; equal-power and exponential follow how we perceive loudness and sound more natural; S-curve eases in and out.
Fades are gain envelopes. Linear multiplies by t; equal-power by sin(πt/2); S-curve by 3t²−2t³; exponential by 10−3(1−t) (a 60 dB sweep, renormalised to 0→1); logarithmic by log₁₀(1+9t). Because we hear loudness roughly logarithmically, the exponential and equal-power shapes feel like an even, smooth change.
Add a soft ending so the audio does not stop abruptly.
Fade intro music under your voice.
Ease in so a call does not start with a blast.
Create a fade-out ending for a track that was cut short.
| Fade length | 0–30 s each |
|---|---|
| Curves | Linear · equal-power · S-curve · exponential · logarithmic |
| Live update | Yes, re-renders as you change settings |
Equal-power or exponential for music and speech — they match how loudness is perceived.
Use the Crossfade Two Files tool for blending two tracks.
Linear fades volume in a straight line, which can sound like it dips a little in the middle of a crossfade. Equal-power follows a curve that sounds smoother and more natural to the ear, especially for longer fades.
Yes — set the fade in duration to 0 and only set a fade-out duration (or vice versa).
This tool runs entirely in your browser using the Web Audio API. Nothing is uploaded, stored or shared — there is no server to send your file to, so it works offline once the page has loaded.
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