This audio joiner uses a local WebAssembly build of FFmpeg. It decodes each source, converts the sound to a common 44.1 kHz stereo layout, and joins the clips in your chosen order. That normalization lets common MP3, WAV, M4A, OGG, FLAC, AAC, OPUS, and WebM audio files share one output.
Joining is sequential: the second clip starts after the first one ends. It does not overlap tracks or mix background music beneath speech. Every source file remains unchanged on your device.