Blends the end of one track into the start of another with an overlapping equal-power crossfade, rather than a hard cut — a smoother join for DJ transitions, podcast segments, or medleys.
Crossfade Two Files blends the end of one recording into the start of another so the transition is smooth — as used by DJs, radio stations and playlist makers. Choose an overlap from 0.1 to 15 seconds.
It uses an equal-power curve so the loudness stays steady through the blend instead of dipping in the middle, as a linear crossfade does.
During the overlap the outgoing file is multiplied by cos(πt/2T) and the incoming file by sin(πt/2T), where T is the crossfade time. Since cos² + sin² = 1 the summed power stays constant for uncorrelated material. If the files are the same signal (correlated), the sum reaches +3 dB mid-fade — a known property of equal-power fades. Optional silence trimming removes dead air at the end of file 1 and the start of file 2 so the blend starts on sound.
Join tracks without gaps.
Blend segments and music.
Fade between sections or into music.
Smooth scene audio transitions.
| Overlap | 0.1–15 s |
|---|---|
| Curve | Equal-power |
| Trim silence | −50 dB threshold, 20 ms room |
Linear fades dip about 3 dB at the midpoint for unrelated sounds; equal-power keeps loudness constant.
Chain: crossfade A+B, then the result with C — or use the Merger with a crossfade.
It's automatically capped to the shorter of the two track lengths, so it never tries to overlap more than either file actually has.
Yes — the Merger can add silence between clips, but this actually overlaps the two tracks with a fading blend, which sounds smoother for music/DJ-style transitions.
This tool runs entirely in your browser using the Web Audio API. Nothing is uploaded, stored or shared — there is no server to send your file to, so it works offline once the page has loaded.
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