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Audio Fade In and Out
Give any song, podcast or recording a smooth start and ending. Drag the fade handles on the waveform, pick a fade curve, listen to the result and download it as MP3 or WAV. Everything runs in your browser, so your audio is never uploaded.
No file handy?
IN
OUT
Drag the IN and OUT handles to set the fade lengths, or type exact values below. Click the waveform to move the playhead.
0:00.0 / 0:00.0
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How to use the Audio Fade In and Out
- Open your audio: drop an MP3, WAV, M4A, OGG or FLAC file on the box, or click to choose one.
- Set the fade in: drag the IN handle or type the length in seconds, then pick a curve.
- Set the fade out: drag the OUT handle or type its length. Use Trim to end the track earlier if you like.
- Listen: press Play fade in or Play fade out to check just the transitions, or play the whole file.
- Download: choose MP3 or WAV and press Download faded audio.
Fade curves explained
A fade multiplies every sample by a gain that moves between 0 (silence) and 1 (full volume). With t as the position inside the fade, from 0 at its start to 1 at its end, the tool uses these standard curves for a fade in (a fade out is the same curve played backwards):
| Curve | Gain formula | How it sounds | Good for |
|---|---|---|---|
| Linear | g = t | Slow change at first, then a sudden drop at the very end of a fade out | Very short fades that only remove clicks |
| Equal power | g = sin(t × π/2) | Keeps the loudness up longer, then falls | Crossfades, quick fade ins |
| S-curve | g = (1 − cos(π t)) / 2 | Gentle at both ends, faster in the middle | Fade ins, smooth transitions |
| Exponential | g = 103(t − 1) (from −60 dB to 0 dB) | Even change in perceived loudness | Music fade outs, long fades |
| Logarithmic | g = log10(1 + 9t) | Fast change, then a long tail | Fade ins that should reach full volume quickly |
Our ears hear loudness roughly on a logarithmic (decibel) scale. That is why the exponential curve, which changes the level by the same number of decibels every second, sounds like the smoothest fade out for music, while a linear fade seems to hang on and then disappear abruptly.
Tips for clean fades
- End on silence. Even a 0.05 second fade at the very start and end of a clip removes the click that appears when audio is cut in the middle of a wave.
- Fade with the music. Start a fade out at the beginning of a musical phrase (often every 4 or 8 bars) so it does not feel cut off.
- Keep WAV for editing. If you will edit the file again, save as WAV and only make an MP3 at the end, so the audio is compressed just once.
- Looping background music. For videos and presentations, a 1 second fade in and a 3 to 5 second fade out make a loop start and end politely.
Frequently asked questions
How long should a fade in or fade out be?
For music, a fade out of 3 to 10 seconds sounds natural, and radio edits often use 5 to 8 seconds. A fade in of 0.5 to 3 seconds softens an abrupt start. For speech and podcasts, short fades of 0.2 to 1 second remove clicks and hard cuts without hiding words.
Which fade curve should I choose?
Exponential (linear in decibels) sounds the most even to the ear and is the best general choice for fading music out. S-curve starts and ends gently and suits fade ins. Linear drops the volume evenly in amplitude, which sounds like it fades slowly at first and then suddenly at the end. Logarithmic drops quickly and then lingers. Equal power keeps the loudness up longer and is the standard curve for crossfades.
Can I fade out before the song actually ends?
Yes. Set End at in the Trim box to the point where the song should stop. The fade out is then applied to the last seconds before that point and everything after it is removed.
Does adding a fade reduce the audio quality?
Only the fade regions change. If you export as WAV, every other sample is kept exactly as decoded. MP3 export re-encodes the audio, so choose 192 or 320 kbps to keep the quality close to the original.
Is my audio uploaded to a server?
No. The file is decoded, faded and encoded on your own device with the Web Audio API and a JavaScript MP3 encoder. Nothing is sent over the internet.
Which file formats can I open?
Anything your browser can decode: MP3, WAV, M4A and AAC, OGG Vorbis, Opus, FLAC, AIFF and the audio track of WEBM or MP4 files in current Chrome, Edge, Firefox and Safari.
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