How do I add a fade in or fade out?

Drop your file onto the tool above, set the fade-in and fade-out length in seconds, choose a smooth or linear curve, then click Apply and download the faded WAV. No account needed.

Does my file get uploaded?

No. The fade is applied entirely in your browser using the Web Audio API — your audio never leaves your device.

What's the difference between the smooth and linear curve?

Linear ramps the volume in a straight line. Smooth uses an equal-power curve that sounds more natural and even, which is usually the better choice for music.

Free tool

Fade your audio in and out, instantly.

Runs entirely in your browser. Drop a clip, set the fade lengths, and get a clean, smooth start and ending — perfect for intros, outros, loops and polished mixes. Nothing is uploaded.

Try it

Drop an audio file

The fastest way to add a professional fade in and fade out without installing anything.

Drop an audio file here

MP3, WAV, OGG, M4A — up to 25 MB. We'll fade the start and end smoothly.

How it works

Your audio never leaves your device

The fader uses your browser's Web Audio API to decode the file, shape the volume curve at the start and end, and re-encode a 16-bit PCM WAV — all on your machine, no server round trip.

Step 1

Drop the file

MP3, WAV, OGG, M4A or FLAC — up to 25 MB.

Step 2

Set the fades

Choose fade-in and fade-out length plus a smooth or linear curve.

Step 3

Download the WAV

Preview first, then save the faded audio.

More free tools

Related free tools

Keep going — every one of these runs free in your browser, no signup.

Audio Trimmer & CutterVisually pick a start and end and export just that segment.Audio Merger & JoinerStitch multiple clips into one seamless file, in order.Audio SplitterSplit a long recording into equal segments or at set marks.Silence TrimmerTrim dead air off the head and tail of a WAV or MP3.

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Want the full studio?

Open the AudioPod dashboard for stem separation, voice cloning, transcription, multilingual narration, and batch processing — all on one free account.

Open the dashboard