Join several audio files into one in your chosen order - locally in the browser, no upload, even with mixed formats and sample rates.
Running locally on your device ...
Running locally on your device ...
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Your files never left your device
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
Several voice memos, podcast segments or music tracks that should become one file? This tool joins two or more audio files in the order you arrange in the tray - completely locally, no file ever leaves your device.
The files do not have to match: different formats, sample rates and channel counts are automatically adapted to the first file (mono is duplicated, stereo averaged, the sample rate cleanly converted). Joins are seamless - no clicks or gaps at the seams.
The total length of the result is subject to the honest device cap (see limits). Output comes as lossless WAV or compact M4A; for MP3, run the result through the audio converter afterwards.
| Input formats | MP3, WAV, M4A, AAC, OGG, OPUS, FLAC |
|---|---|
| Auto-conversion | MP4 |
| Output formats | WAV, M4A |
| Batch processing | Yes |
| Processing | Locally in your browser (WebCodecs) |
| File upload | None |
Limitations: The total result length has an honest per-device cap (desktop about 20 minutes, tablet 15, phone 10; more with plenty of memory) - anything above is clearly refused, never silently truncated. All files are adapted to the FIRST file sample rate and channel count; with more than two channels (e.g. 5.1) the front channels are taken. Compressed inputs need the browser WebCodecs decoder. No crossfade - files butt together directly.
No, everything runs locally in the browser.
Yes. After dropping, drag the files into order in the tray; they are joined in exactly that order.
No problem: every file is decoded and adapted to the first one (sample rate, channels). MP3 + WAV + M4A in one run works.
No. The stream is re-timed gaplessly - the pieces flow directly into each other.
No, deliberately not - files are joined hard. Use the audio fade tool on individual pieces beforehand.
Trim audio · Fade audio in/out · Remove silence · Audio converter