Merge several audio files into one continuous track — songs, voice notes, podcast segments — in the order you choose. It runs in your browser, so your audio is never uploaded.
Quick answer: Drop two or more audio files below, drag them into the order you want, choose an output format, and click Join. The files are merged into one track in your browser and downloaded — nothing is uploaded. Different formats and bitrates are handled automatically.
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MP3, WAV, M4A, OGG, OPUS, FLAC, voice notes · add two or more · nothing uploaded
The tool runs FFmpeg compiled to WebAssembly right in your browser. When you click Join it decodes every file you added, stitches them end to end in your chosen order with no gap between them, and encodes the result as a single track. Because each file is decoded first, you can freely mix formats — an MP3, a WAV and an M4A can all go into the same job, and differences in bitrate or sample rate are reconciled automatically.
Everything happens on your device, so voice notes, interview clips or music never get uploaded to a server. Pick MP3 for a small, universally compatible file, WAV if you want lossless quality for further editing, or M4A for efficient AAC compression. The order in the list is the order they play, so arrange the tracks with the arrows before you join.
Frequently Asked Questions
Yes. Mix MP3, WAV, M4A, OGG, OPUS and FLAC in one job, mono or stereo. Every file is decoded at one sample rate and re-encoded into a single track, so a 48 kHz voice note next to a 44.1 kHz song never plays at the wrong speed. The Match tracks option also evens out their loudness.
Yes. Use the up and down arrows to arrange the files; they are joined top to bottom in exactly that order. By default there is no gap between them — you can add a 1 or 2 second pause, or a 2 or 5 second crossfade.
No. Joining runs entirely in your browser, so your audio never leaves your device and there is no server size limit.
MP3 (128, 192 or 320 kbps) for a small file that plays everywhere, M4A (AAC) for efficient high-quality compression, WAV or FLAC for lossless audio, and OGG or OPUS. MP3 at 192 kbps is a good default.
No fixed limit, but because it runs in browser memory, joining many long files at once can get heavy on some devices. For very large jobs, merge in batches.
A short MP3 or WAV join needs no extra download. M4A, OGG, FLAC and OPUS output — and MP3 longer than four minutes — use the FFmpeg engine, which is downloaded once (~25 MB) and then cached. Encoding then scales with the total audio length.