Fade audio in and out
A clean start and a clean ending.
Drop files here
or click to choose from your deviceAccepted: MP3, M4A, AAC, WAV, OGG, OGA, OPUS, FLAC, WEBA
Up to 3 files per runUp to 20 MB per file5 runs per dayRemove limits with Pro✓ Works offline
Your files stay on your device
This tool runs entirely in your browser. Nothing is uploaded, nothing is stored, and you can even turn off your internet connection before you start.
Example
Example: a podcast theme cut to 32 seconds, with a 4-second fade-out
A podcast uses 32 seconds of a royalty-free track as its intro theme, cut from a longer piece, so it starts and stops abruptly. intro-theme.wav goes in with Fade in 0.5 s, Fade out 4 s, Curve Equal power, and Save as WAV, so it can go back into the editor without a lossy generation.
- The first half second rises from silence to full volume; a quarter of a second in, the music is at 71 % of its amplitude.
- The last 4 seconds, from 0:28 to 0:32, fall to exact silence on the final sample; the 27.5 seconds between the fades are untouched.
- Only the samples are scaled: the clip is still 32 seconds long, at the same pitch and tempo.
| Time | Equal power | Straight line | Slow near silence |
|---|---|---|---|
| 0:28, fade starts | 100 % | 100 % | 100 % |
| 0:29 | 92 % (−0.7 dB) | 75 % (−2.5 dB) | 56 % (−5.0 dB) |
| 0:30 | 71 % (−3.0 dB) | 50 % (−6.0 dB) | 25 % (−12.0 dB) |
| 0:31 | 38 % (−8.3 dB) | 25 % (−12.0 dB) | 6 % (−24.1 dB) |
| 0:31.5 | 20 % (−14.2 dB) | 13 % (−18.1 dB) | 2 % (−36.1 dB) |
| 0:32, end | silence | silence | silence |
intro-theme-fade.wav, still 32 seconds, which ends as a fade instead of a cut. The percentages are the amplitude kept: two seconds before the end the equal-power curve is still at 71 %, where the straight line is at 50 % and the slow curve at 25 %.
How it works
- Add the audio file. Several at once is fine — they all get the same fades.
- Set how long each fade should be. Three seconds at the end suits most music; half a second is enough to stop a recording ending with a click.
- Leave the curve on equal power unless you have a reason not to.
- Press fade and download.
Frequently asked questions
- Why not just a straight line?
- Because loudness is not linear in amplitude, and a straight line audibly rushes the middle of the fade and lingers at the quiet end. The equal-power curve — a quarter turn of a sine — is what editors use, and it sounds like a steady fade rather than a sudden one.
- When would I want the straight line, then?
- For a long fade to silence at the end of a track, where the slow tail is the effect you want. It is also what some broadcast specifications ask for by name.
- Does it change anything else about the sound?
- No. The samples are scaled and nothing is re-timed, so the length, the pitch and everything between the fades are untouched. Re-encoding to a lossy format does what re-encoding always does; choose WAV if that matters.
- What if the file is shorter than the two fades?
- They are shrunk in proportion so they fit without overlapping: on a 4-second clip, a 2-second fade in and a 3-second fade out become 1.6 and 2.4 seconds. You still get a fade in and a fade out; they are just shorter than you asked for.
- Should I save as WAV or MP3?
- WAV if the file goes back into an editor or will be encoded again later: it is written without loss. MP3 or M4A for a finished file that only has to be played or uploaded. With Same as the original, an MP3 stays MP3, and OGG and FLAC become MP3.
- How long a recording can I fade for free?
- The free plan takes files up to 20 MB, 3 per run and 5 runs a day. 20 MB is about 20 minutes of a 128 kbps MP3, but only about 2 minutes of CD-quality WAV, so a long WAV may need trimming or converting first.
- Is anything uploaded?
- No. It all happens in your browser.