Join audio clips into one file

The job

Joining audio means more than appending bytes — formats differ. The tool decodes every file through the browser's audio engine, resamples everything to 44.1 kHz, matches mono/stereo to the widest input, and writes one 16-bit WAV you can drop into an editor.

Joining a playlist

Choose up to 8 files (100 MiB each, 10 minutes total). Reorder with the arrows — the list order is the join order — then join and download.

• Output is WAV: lossless and universally readable, which is why it can be much larger than the mp3s it came from.
• A few milliseconds of silence can appear at each join — decode padding, not a bug. For true gapless joins, an audio editor's crossfade is the right tool.
• Everything happens in the browser; files never upload.

Where it stops

Browser-decodable formats only — mp3, wav, ogg, m4a generally work; exotic codecs don't. If a file fails to decode the tool says which one; trim it out or convert it first with audio-to-wav.