Audio Fade In / Fade Out
Smooth the start or end of an audio file by ramping the gain over a few seconds. Hides clicks at hard edits, gives songs natural endings, prevents pops on ringtones. The curve type changes how the fade feels. Log curves track human loudness perception and sound natural; linear curves are more abrupt at the tail.
How it works
Drop the file
Music, voice, anything that needs a softer edge.
Up to 200 MB
Set in / out durations
Pop and rock songs typically fade out over 4-8 seconds. Ambient tracks 12-20 s. Voice clips 100-500 ms. Set either side to 0 to skip that fade. Independent fade-in and fade-out durations.
Per-sample gain envelope
Pick a curve
Log (default). Most natural-sounding for fade-outs because it matches how the ear perceives loudness change. Linear. Straight line, slightly abrupt at the end. Exp. Slow start, fast finish, useful for special effects.
Output: 16-bit WAV
Soften the edges
Give a track a real ending instead of a hard stop
A song that just cuts off feels unfinished, and a clip with a hard edit can pop or click. A fade smooths both, ramp the volume up at the start, down at the end, and the audio breathes in and out naturally. Set each side independently, or zero one out if you only need a fade on one end.
The curve matters
Why log fades sound right and linear ones don't
Your ears hear loudness logarithmically, so a straight linear fade seems to drop fast then hang on too long at the tail. The log curve (the default here) corrects for that and fades at what sounds like a steady rate, the natural choice for music. Linear is there when you want something more abrupt, and the exponential curve is handy for effects.
Pairs with everything
The finishing touch after a trim or a loop
Fades are usually the last step: smooth the edges after you've trimmed a clip, hide the seam on a loop, or polish the end of a bounce before you export. It only touches the start and end, the middle stays at full level, and it all runs in your browser with nothing uploaded.
Frequently asked questions
Why does the fade curve matter?
Human hearing is logarithmic. A linear gain ramp from 1.0 to 0.0 sounds like the volume drops faster at the start and lingers longer at the tail, because each successive halving of amplitude is one perceptual step. A log curve compensates for that and produces a fade that sounds like it's progressing at a constant rate. For most music, log is the right default.
How long should a fade be?
Songs: 4-8 seconds for pop/rock fade-outs, longer for ambient. Loops/intros: short (100-300 ms) just to hide the edge. Voice: 50-200 ms is enough to prevent clicks; longer wastes audible content. Listen to the result. If you can hear the fade starting, it's probably the right length for music; if you only notice it ending, it might be too short.
Can I fade the middle of an audio file?
Not with this tool. It only handles start and end fades. To duck a middle section, split the file with the Audio Splitter, fade the middle clip's edges separately, and re-merge. Or do it in a DAW with automation.
Will fading reduce overall volume?
Only at the fade boundaries. The middle of the file is at full level. If you want to reduce the whole file's volume, use the Volume Booster with a negative dB value.
Goes well with this tool
Audio Trimmer
Trim before fading.
Audio Cutter
Cut out a section instead.
Silence Remover
Auto-trim awkward pauses.
Loop Maker
Repeat with crossfade between iterations.
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