Is the MP3 fade tool free?
Yes. Adding a fade in and fade out to an MP3 is completely free, with no signup or watermark.
Does it upload my MP3?
No. The fade export runs locally in your browser, so your MP3 stays on your device and is never uploaded.
Can I apply only fade in or only fade out?
Yes. Either fade can be set independently, as long as the total fade time stays shorter than the clip.
Is this a full audio editor?
No. It is a focused polish tool for simple MP3 fade jobs rather than a complete editing suite.
Does it work on mobile?
Yes. Because it runs in the browser, you can add fades to an MP3 on a phone or tablet as well as a desktop.
How do I fade an MP3 in and out?
Set the fade lengths in milliseconds and export. The defaults are 800 ms at each end, and the change is applied in your browser with nothing uploaded.
How long should a fade be?
800 ms is a good default for music, which is what the tool starts with. For speech, 200 to 400 ms is plenty: a long fade on a voice sounds like an error rather than a choice.
Why does my clip start with a click?
Because the cut landed mid-waveform. Even a 100 ms fade in removes the pop that causes, which is the single most common reason to use a fade at all.
Should I trim before or after fading?
Trim first. Fading and then trimming cuts the fade off the end, which defeats the point entirely.
Does fading change the loudness of the track?
No. It changes the shape of the volume at the ends. For an overall level change, use the MP3 Volume Changer.