Audio Joiner & Crossfade
Join clips with smooth crossfades. Export MP3 or WAV.
Private by design
Your inputs stay on your device and are not sent to our servers. Optional usage analytics does not receive your files or tool inputs.
How to use Audio Joiner & Crossfade
- Add up to eight clips within the combined two-minute source limit.
- Reorder clips with the arrow buttons; trim each clip and set its volume. Choose the crossfade duration and curve.
- Prepare the preview, compare it with the originals, then download MP3 or WAV.
What are the limits of Audio Joiner & Crossfade?
Browser-supported MP3, WAV, M4A, AAC, OGG, FLAC and WebM inputs; mono or stereo only. Up to 20 MB per file, 40 MB and two minutes of source audio combined. Processing runs locally at 44.1 kHz with a cancellable worker. WAV is 16-bit PCM; MP3 re-encoding is lossy, cannot restore missing detail, and may add frame padding or use a lower sample rate at low bitrates. Accessible source metadata is not preserved. Peak normalization is not LUFS mastering or noise removal. The encoder reduces gain if needed to prevent clipping. Shorter recordings are best on phones. Crossfades are capped at half the shorter neighboring clip to prevent three-way overlaps. Equal-power fades may raise correlated peaks; output peak protection can reduce overall volume.