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How to add a fade in and fade out

A fade is a gradual change in volume — up from silence at the start (fade in) or down to silence at the end (fade out). It's the difference between a clip that begins and ends with a jarring click and one that feels finished. Adding fades takes seconds and instantly makes any clip sound more professional.

This guide uses the free AudioTrim editor, which runs entirely in your browser. Nothing is uploaded, so you can fade a private recording or a song clip without it leaving your device.

When to use a fade

Ringtones and clips — a fade out stops the audio gracefully instead of cutting off mid-note.
Music loops and intros — a fade in eases the listener into the track.
Spoken word — a short fade hides the tiny clicks that can appear where you trimmed.
Background music under a voiceover — fades let the music enter and exit without distracting from the speech.

Step by step

Open your clip. Drag an audio file onto audiotrim.app, or trim a clip first if you only want to fade part of a longer track.
Decide where the fade applies. To fade the whole clip, leave nothing selected. To fade only a portion, drag across the waveform to select that region first.
Add a fade in. Click Fade in. The start of the audio now ramps up from silence — you'll see the waveform taper to a point at the beginning.
Add a fade out. Click Fade out. The end now tapers down to silence. You can apply both on the same clip.
Preview. Press Play and listen to the start and end. If a fade feels too long or too short, click Undo, adjust your selection length, and reapply.
Download. Export as MP3 or WAV from the Download section.

Tip: The length of the fade follows your selection. For a longer, more dramatic fade-out on a song, select the last several seconds before clicking Fade out. For a quick, subtle fade on speech, a half-second selection is enough.

How fades actually work

A fade multiplies the audio's volume by a smoothly changing value — from 0 up to 1 for a fade in, and from 1 down to 0 for a fade out. Because the change is gradual rather than instant, your ear hears a natural swell or decay instead of the abrupt "click" that happens when a waveform is chopped at a non-zero point. That click is caused by a sudden jump in the signal; a fade removes it by easing the level to zero at the edges.

Frequently asked questions

Can I fade just the middle of a clip?

Yes. Select the region you want, then apply the fade — it follows your selection rather than the whole file.

How long should a fade be?

For speech, a quarter- to half-second is plenty. For music endings, two to five seconds sounds natural. For dramatic effect, longer still.

Will fading reduce audio quality?

No. A fade only changes volume over time; it doesn't add compression or artifacts. Export at a higher bitrate if you want to preserve every detail.

Can I combine a fade with a trim?

Absolutely — trim the clip to the length you want first, then add the fades. That's exactly how ringtones are made.

Add a fade now →