Audio Joiner
Add your audio files, drag them into the right order and merge them into a single track — with an optional pause between them. Everything happens in your browser, so nothing gets uploaded.
Add audio files
or drag and drop them here
Add at least two audio files to join them.
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Your files are processed locally in your browser. They are not uploaded to our servers.
How to use
- Add two or more audio files — MP3, WAV, M4A, OGG and most other formats work, and you can mix them freely.
- Put them in the right order with the arrow buttons; the length of each file and the total are shown as you go.
- Pick the output format and, if you want, a pause between tracks — then click “Join audio files” and download the result.
What is this tool?
Audio Joiner merges several audio files into one continuous track using FFmpeg compiled to WebAssembly. Files with different formats, sample rates or channel counts are normalized automatically, so you can throw a phone recording, a downloaded MP3 and a WAV export into the same list without preparing them first. Because everything runs on your device, interviews, lecture recordings and unreleased music never touch a server.
Common uses
- Stitching voice memos or interview parts into one recording for transcription
- Combining audiobook or podcast chapters into a single file
- Building a continuous mix or practice track from separate songs
- Joining recordings that got split because of a phone's file size limit
FAQ
Are my audio files uploaded to a server?
No. The merge runs entirely in your browser. Only the FFmpeg engine (~31 MB) is downloaded from a CDN on first use and then cached — your audio never leaves your device.
Can I mix different formats, like an MP3 and a WAV?
Yes. Each file is normalized to a common sample rate and channel layout before joining, so mixed formats, mono and stereo files all work together.
Does joining reduce the audio quality?
The result is re-encoded once, so a lossy output like MP3 loses a little quality — at 192 kbit/s that is inaudible for speech and very hard to hear for music. Choose WAV for a lossless result.
Can I add a pause between the tracks?
Yes — pick 1, 2 or 3 seconds under “Gap between tracks”. Silence is inserted at every join, which is handy for audiobook chapters and spoken-word recordings.