Crossfade is a transition technique where the end of one track fades out while the beginning of the next fades in, creating a smooth overlap. It is ideal for continuous music mixes, soundtracks, or podcasts where abrupt cuts would sound jarring.
Audio Joiner
Merge multiple audio files in sequence with configurable crossfade — no installation needed.
Merge multiple audio tracks in seconds
The Audio Joiner concatenates two or more audio files into a single continuous track. You can reorder tracks by dragging them, configure a smooth crossfade transition between them, and download the result as WAV. All processing uses the Web Audio API directly in the browser.
Four steps to join your audio files
- Open or drag multiple audio files (MP3, WAV, OGG, FLAC, AAC, or M4A).
- Reorder tracks by dragging them by the side handle to define the desired order.
- Set a crossfade if you want smooth transitions between tracks (0 to 5 seconds).
Sources and references for this tool
These references help contextualize formulas, standards, APIs and limitations used on this page. They do not replace professional validation when a result has legal, financial, medical or operational impact.
- AudioBuffer — Web APIsMDN Web Docs — Interface representing an audio buffer — foundation for concatenating multiple tracks.
- AudioContext.createBuffer() — Web APIsMDN Web Docs — Method to create a new AudioBuffer with defined size and sample rate.
- Web Audio API — Resampling and Sample Rate ConversionW3C / WebAudio Working Group — Spec section on audio resampling — foundation for joining tracks with different sample rates.