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By ShinobiTools Team · Last updated: August 2026
A track that starts with a bang or stops mid-note sounds unfinished. Set how many seconds at each end and get a clean fade in and out. Audio or video in, MP3 out.
Two seconds is the safe answer for music and works for almost everything. Half a second is enough for speech — longer and the first words disappear. For a background track under a voice-over, four or five seconds feels natural. Set one of the two to zero if you only want a fade at one end.
A fade changes the volume at the start and end; it doesn't shorten the file. If there's a stretch you want gone entirely, trim it first and then fade the piece you kept, so the fade sits exactly where the audio now begins.
Your file is uploaded to our own machine, processed there, and deleted immediately afterwards. Limit: 400 MB.
Not every fade is the same shape. This tool ramps the volume in a straight line — a linear fade — from silent to full over however many seconds you set, and the same straight line on the way out. It's the simplest curve there is, and for most music and speech it's also the one that sounds most predictable: the midpoint of the fade is the midpoint of the volume change, with no surprises. Some audio software instead uses a curved, "equal-power" fade that stays louder for longer before dropping away, which can sound smoother on a fast crossfade between two tracks playing at once — but for a fade in from silence or out to silence, which is what this tool does, a straight line does the job without adding a knob nobody asked for.
Set the same number of seconds at both ends and the two fades won't necessarily feel equal, because what they're masking is different. A fade-in is hiding the start of a sound the listener hasn't heard yet, so it can be short without anyone noticing. A fade-out is cutting off a sound that's already established in the listener's ear, and a fade that's too short there reads as an edit rather than an ending. If you only adjust one of the two numbers, it's usually worth making the fade-out the longer one.
Want an even volume throughout instead of a fade? Normalize audio does that. Background hiss the real issue? Remove silence from audio is the tool for that.
Enter how many seconds you want at the start and at the end, then download the result.
Yes, set the fade in to 0.
Two seconds suits music; half a second is plenty for speech.
Yes, you get the faded audio back as an MP3.
Yes. No account, no watermark, no daily limit.
No. Only the volume at each end changes.