Combine multiple audio files into one track in your chosen order
What is the Audio Joiner?
The audio joiner works like this: it concatenates audio files into one track - instantly with no re-encoding when formats match, or with on-the-fly conversion when they differ. Everything happens on your device - the input never leaves your tab unless the tool clearly states it performs a server-side lookup.
How to use the Audio Joiner
Add two or more audio files.
Reorder them with the arrows until the sequence is right.
Pick the output format (MP3 for maximum compatibility).
Press Join and download the single merged file.
Features
Powered by in-browser FFmpeg (WebAssembly)
Your files never upload anywhere
Progress shown while processing runs
Common mistakes to avoid
Choosing bitrates below the platform minimum
Re-encoding already-compressed files repeatedly
Examples
Input
Result
3 MP3 podcast segments
One continuous MP3 in the order you arranged
Best used for
Getting a reliable answer for audio joiner without installing an app
One-off tasks done in under a minute from any device
Checking results before committing them to something important
Working on a phone where desktop software is unavailable
Privacy
Audio and video processing runs on your device with WebAssembly FFmpeg; your files are never uploaded.
Frequently asked questions
Why does joining sometimes take longer?
Mixed formats or different bitrates force a re-encode; same-format files are stream-copied in seconds.
Does it fade between tracks?
No hard transitions are inserted - files join at their exact boundaries. Add fades with the Audio Trimmer first if you want crossfades.
When is joining instant versus re-encoded?
Matching formats concatenate losslessly in a second; mismatched ones convert on the fly to a common target - the tool always says which path ran.
Does the order of the list matter?
Yes - tracks play top to bottom, so drag them into order before joining.
Related tools
Audio Trimmer - Trim MP3, WAV, M4A audio files online by timestamp
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Video to Audio - Extract MP3, WAV, M4A audio from MP4, MKV, MOV video files