Audio Merger

Merge multiple audio files in your browser. Trim segments, fade in/out, add crossfades, preview, and export to WAV.

Drop audio files here or

Add at least two tracks (MP3, WAV, OGG, M4A, etc). All processing happens in your browser.

Project Sample Rate (Hz)

Tip: Keep 44100 for maximum compatibility.

Default Crossfade (seconds)

Automatically overlaps consecutive tracks.

Headroom Gain (dB)

Reduces peak clipping when overlaps occur.

0:00.000 0:00.000

Click anywhere on the waveform to jump to that position • Hover to see play/pause control

FAQ & Implementation Notes

Fades & Crossfades: Each track supports its own fade in/out. The global crossfade overlaps consecutive tracks by your chosen duration while also applying their fades.
Trimming: Set Start and End (in seconds) to slice a smaller segment from each source before mixing.
Preview: Real-time scheduling with Web Audio API.
Export: Rendered with OfflineAudioContext and saved as WAV (lossless).
Privacy: Files never leave your device.