Add the files you want to join, put them in the order you want them played, and export the result as a single track. MP3, WAV, FLAC and M4A all work, and you can mix formats in one job — everything is decoded to the same internal format before it is joined, so a WAV and an MP3 sit together without a seam.
It is the same job under several names. Use it as an audio joiner online to merge audio files end to end, as an audio merger or MP3 merger to combine MP3 files into one, or as an MP3 joiner for the chapters of an audiobook. You can merge MP3 online without installing anything, merge WAV files, join MP3 files recorded on different devices, combine audio files of mixed formats, or merge songs online into a single continuous track for a playlist or a set.
The merge happens in your browser using the Web Audio API. Your files are never uploaded, which is why there is no size limit, no queue and no watermark: nothing leaves your device, so there is nothing for us to charge for or to store.
One thing worth knowing: MP3 encoding adds a short silence at the start and end of every file. Joining MP3s can therefore leave small gaps you did not put there. If you need a seamless join — a DJ mix, a continuous recording — use WAV or FLAC sources and export once at the end.
Most online audio joiners give you a list: files go in, they play in that order, and that is all you control. This one gives you a timeline with several tracks stacked on top of each other. Drag a clip along a track to change when it starts, or drag it onto another track to have it play at the same time as something else — a voice over music, an intro under a fade. Joining end to end is simply the case where everything sits on one track.
Put the playhead where you want the cut and split the clip in two, then drag either half wherever it belongs or delete it. Trim the ends of a clip to drop a cough, a count-in or a silence. Zoom in until you can see individual waveform peaks when the edit needs to land on a beat, and zoom back out to see the whole arrangement.
With magnet snapping on, a clip you drag near another one jumps flush against it — no one-millisecond gap you cannot see but can hear. Glue mode keeps neighbouring clips moving together, so shifting one part of a sequence does not open a hole behind it. Both can be switched off when you want a deliberate pause.
Each track has its own volume, which is what you need when a voice recorded on a phone has to sit over music mastered far louder. Every edit — a move, a split, a trim, a volume change — can be undone and redone, so you can try an arrangement without committing to it.
Export the finished arrangement as MP3 when you need a small file to send, or WAV when it is going on to be edited further and you do not want another round of lossy encoding. The whole thing runs on your own machine through the Web Audio API — no upload, no queue, no file-size limit and no watermark.
MP3, WAV, FLAC and M4A, and you can mix them in one job. The finished file exports as MP3 or WAV.
Yes. Put them on separate tracks and overlap them on the timeline — that is how you lay a voice over music.
Yes. Split the clip at the playhead and delete the piece you do not want, or trim it from either end.
No. Nothing is uploaded, so the only limit is your own computer's memory.
No. Everything happens in your browser and no audio leaves your device.