Is the MP3 merger free?
Yes. Combining MP3 files into one track is completely free, with no signup or watermark.
Does it upload my MP3 files?
No. The merge and export run locally in your browser, so your audio stays on your device and is never uploaded.
Can I reorder the MP3 files first?
Yes. You can change the queue order before exporting so the tracks combine in the sequence you want.
Does it add crossfades?
No. This merger joins the MP3 files in order without crossfades, keeping the workflow simple and predictable.
Does it work on mobile?
Yes. Because it runs in the browser, you can merge MP3 files on a phone or tablet as well as a desktop.
How do I join several MP3 files into one?
Add the files in the order you want them to play and export. They are concatenated and re-encoded as a single MP3 in your browser, with nothing uploaded.
Why does the volume jump between the joined clips?
Because they were recorded or mastered at different levels, and merging does not normalize them. Match the volume first: a level jump at the seam is far more noticeable than any compression artefact.
Why do I hear a click at the join?
Because both clips were cut mid-waveform. Fading the end of one and the start of the next by 100 to 200 ms removes it.
Does merging lose quality?
A pass, on every input, because everything is re-encoded. Merge once at the end from the best sources you have rather than joining files you already merged.
What if the files have different bitrates?
The result is only as good as the worst input. Bring them to a common quality before joining, or the whole merged file inherits the weakest one.