About the Fade In and Fade Out
Add a fade-in at the start and a fade-out at the end of a song, ringtone, podcast or clip, so it begins and ends smoothly instead of cutting in or off abruptly. Set how many seconds each fade lasts, choose an even or smooth shape, and download the result.
The fades are added in your browser, so the file is never uploaded. Any audio file works, as well as the sound of videos, up to 100 MB.
How it works
A fade-in starts at silence and raises the level to normal over the time you set; a fade-out lowers it to silence over the last seconds. The tool first measures the recording's exact length, so the fade-out ends precisely on the last sample.
The even (linear) shape changes the level at a steady rate: half way through a 4-second fade the sound is at half its level. The smooth (S-curve) shape starts and finishes gently and moves fastest in the middle, which often sounds more natural for music; it is also at half level half way through.
Everything between the fades is left exactly as it was. Set either fade to 0 to fade only one end.
Assumptions and limits
- The two fades together can't be longer than the recording.
- Fades are measured in seconds and can use decimals, such as 0.5.
- MP3, M4A and OGG are saved at 192 kbps; WAV and FLAC are exact.
Worked examples
A ringtone that doesn't start with a jolt
A 30-second clip with a 2-second fade-in and a 3-second fade-out starts softly and ends cleanly.
A song cut from a longer mix
Fade out over the last 8 seconds so the song ends like a radio edit instead of stopping mid-phrase.
Podcast intro music
Use a 1-second fade-in and a 4-second smooth fade-out on the jingle before the talking starts.
How to use the Fade In and Fade Out
- Open your track. Song, clip, jingle or recording.
- Set both fade lengths. In seconds; 0 skips that end.
- Save the faded track. Listen, then download it.
Frequently asked questions
How do I add a fade in and fade out to an MP3?
Choose the MP3, type how many seconds each fade should last (for example 3 and 5), pick a shape and press Add the fades. The faded MP3 is made in your browser and is ready to play or download in seconds.
How long should a fade-out be?
Two to five seconds suits most songs and clips. Ringtones and short sounds work with one or two seconds, while a slow musical ending can take eight to ten. Very short fades of under half a second mainly remove a click.
What is the difference between linear and smooth fades?
A linear fade changes the level at the same rate all the way. A smooth S-curve changes slowly at the start and end and faster in the middle. Both reach half level half way through; try both and keep the one that sounds best.
Can I add only a fade-out?
Yes. Set the fade-in to 0 and only the end fades. In the same way, set the fade-out to 0 to fade in at the start and keep a sudden ending.
Does the fade change the rest of the audio?
No. Only the first and last seconds you set are changed. The middle keeps every sample, and with WAV or FLAC it is bit-for-bit the same as the original.
This tool runs entirely in your browser. What you enter or upload stays on your device and is never sent to our servers.