Audio Joiner

Audio Joiner combines several audio files into a single track. Add up to 20 MP3, WAV, FLAC, Ogg, Opus or WebM audio files, listen to each one, put them in order by dragging, optionally insert silence between them, and save the result as MP3, WAV, FLAC, Ogg Vorbis or Opus. All decoding, resampling and encoding is done in your browser by libav.js, an open-source WebAssembly build of FFmpeg’s libraries loaded from this site.

Joining voice notes, chapters, song sections or podcast segments is a common job that usually requires an audio editor or an upload service. This tool keeps your files on your device and tells you when files differ in sample rate, channels or codec, because they must then be converted to a common format and re-encoded.

1. Drop two or more audio files onto the upload area (MP3, WAV, FLAC, Ogg, Opus or WebM audio).
2. Check each file’s format, length, sample rate and channels in the list.
3. Drag files by the ⠿ handle, or use the arrow buttons, to set the order.
4. Press ▶ to listen to any single file.
5. Set optional silence between tracks and choose the output format and bitrate.
6. Press Join audio, listen to the result and download it.

• Joins 2–20 files of mixed supported formats into one track
• Drag-and-drop reordering with mouse or touch, plus arrow buttons
• Play each source file before joining
• Per-file name, format, codec, length, sample rate and channels
• Total joined length, including optional silence between tracks
• Warnings when sample rates, channels or codecs differ
• MP3, WAV, FLAC, Ogg Vorbis and Opus output
• Real per-file progress and a full reset that stops processing

• Put files in the right order before joining — the output is one continuous track.
• Use files with the same sample rate where possible to avoid resampling.
• Add 0.5–2 seconds of silence between separate recordings.
• Choose WAV or FLAC if you plan to edit the joined file further.
• Check the joined result before deleting the originals.