Runs on your device · Your file never leaves your device.
Add the recordings, put them in order, and get back one file. Voice memos recorded in pieces, a lecture split across several files, chapters of an audiobook, or a playlist you want as a single MP3 for a car stereo or a slideshow.
The files need not match: a stereo MP3 at 44.1 kHz, a mono WAV at 48 kHz and an M4A from a phone are all brought to one sample rate and channel count before they are joined. Leave up to five seconds of silence between tracks, or switch on a one-second crossfade so the end of each track melts into the next.
Everything runs in your browser. Each file is decoded in turn and handed to the encoder straight away, so the memory in use is one track at a time rather than all of them — a long merge is not limited by holding every file at once.
How to Merge audio: join several files into one
Add two or more audio files.
Order them with the arrows; choose a pause or a crossfade if you want one.
Press Merge into one MP3 (or WAV) and download merged.mp3.
Not for: Mixing tracks on top of each other — files are joined one after another, not layered.
Frequently asked questions
Are my files uploaded to a server?
No. This conversion runs entirely inside your browser using your own device’s processing power. The file never leaves your computer or phone, which is why it also works when your connection drops.
Can I mix formats — MP3 with WAV or M4A?
Yes. Every file is decoded to raw audio and resampled to a common rate, so the format each one came in does not matter. The result is one MP3 or one WAV.
How do I change the order?
With the up and down arrows next to each file. The list, top to bottom, is the order of the finished file.
Is there a limit?
One MP3 can hold a little over two hours of stereo here, one WAV about fifty minutes (twice that in mono). Past that the page says so plainly, and the fix is to merge in two batches, then merge the two results.