Crossfade
Drag & drop your files
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Accepted: MP3, WAV, M4A, FLAC, OGG, AAC, OPUS, AIFF, AMR, APE
How to use Crossfade
- 1
Upload two audio files
The crossfade happens between file 1 → file 2 in that order.
- 2
Set the crossfade duration
Length of the overlap in seconds.
- 3
Download the crossfaded file
Seamless transition between both tracks.
Frequently Asked Questions
- What is a crossfade?
- A transition where one track fades out while the other fades in. Used to blend two tracks seamlessly — the standard for DJ mixes and album flow.
- How long should the crossfade be?
- 1–2 s for pop songs, 3–5 s for ambient or house, 0.5 s for fast-paced edits.
- Does the audio overlap or play sequentially?
- It overlaps. If file A ends at 3:00 and file B starts at 0:00 with a 2 s crossfade, the total length is 3:00 + (length of B) − 2 s.
- Why does this need exactly 2 files?
- Crossfading is defined between two tracks. For merging 3+ files, use the Audio Merger.
Crossfading Explained
A crossfade is the audio version of a dissolve. One track fades out while the other fades in, overlapping in the middle. The result is a seamless transition where the listener never hears a cut.
Where Crossfades Are Used
- DJ mixes: blend tracks so the beat never stops.
- Album flow: bridge two songs that should feel connected.
- Podcast segments: transition between ad read and content smoothly.
- Meditation and ambient: avoid jarring changes of texture.
Choosing the Duration
- 0.5 s — fast pop edits and radio shows.
- 1–2 s — standard for most music transitions.
- 3–5 s — ambient, house, meditation.
- 8–30 s — cinematic and long-form ambient.
Curve Shapes
Linear is the default. Quarter sine gives a gentle S-curve and is popular for ambient music. Exponential works well when the outgoing track is louder than the incoming one.
How It Works Internally
The two files are decoded in parallel, then FFmpeg's acrossfade filter blends them over your chosen duration. The output is a single file with the overlap applied.
Privacy
Everything runs locally in your browser. Your unreleased mixes and demos never leave your device.