Audio Joiner — Merge Audio Files
Combine songs, voice notes or recordings into a single file. Put them in order, add a pause or a smooth crossfade between them, and save as MP3 or WAV. Nothing is uploaded.
Drop audio files here or
Your files never leave your device. Everything is processed in this browser tab: no upload, no server copy.
How to join audio files
- Drop two or more audio files onto the box, or click "Choose audio files".
- Use the arrows to put them in order. Optionally add a pause, or a crossfade so each file blends into the next.
- Choose MP3 or WAV and click "Join audio". Listen to the result, then click "Download".
Join any mix of formats
Files can be MP3, WAV, M4A (including iPhone voice memos), AAC, OGG, Opus, FLAC or WebM, in any combination. Each one is decoded by your browser, converted to a common sample rate, and joined in the order shown. If any file is stereo the result is stereo; mono files are placed in both channels.
A pause inserts silence between files, which suits a playlist of separate recordings or a language-learning drill. A crossfade overlaps the end of each file with the start of the next and blends them with an equal-power curve, so there is no dip in volume: ideal for a continuous mix or a podcast with music beds.
MP3 or WAV?
MP3 at 192 kbps sounds very close to the original for music and speech and is about a tenth of the size of WAV, so it is the best choice for sharing. Choose WAV if you will keep editing the audio, since it is lossless. Joining happens entirely in your browser, so private recordings stay on your device.
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Frequently asked questions
Are my files uploaded?
No. Audio is decoded and joined by your browser on your device. Nothing is sent to a server.
Can I join different formats together?
Yes. Mix MP3, WAV, M4A, OGG, FLAC and others in any order; they are all converted to the format you choose.
How do I change the order?
Use the up and down arrows next to each file. Remove a file with the ✕ button.
What does crossfade do?
It overlaps the end of one file with the start of the next and fades between them, so there is no gap or sudden change in volume.
Is there a limit on files or length?
No fixed limit. Very long joins need more memory; if your browser struggles, join files in smaller groups.