Merge audio
Concatenate audio files into one MP3.
This runs in your browser. Nothing is uploaded. Longer clips take longer here than they would on a fast server — that is the trade-off for not sending the file.
About Merge audio
Concatenates audio files into one MP3 in your browser with FFmpeg concat, without uploading the parts to a joiner.
Interview part 1 and part 2, a cold open plus a show, two voice memos that should have been one — drop them in order. The page concatenates via FFmpeg and writes a single MP3. Mismatched sample rates get pulled onto one encode rather than a brittle stream copy that breaks in half the players.
Order is drop order. There is no playlist editor. Loudness will jump if one file was recorded in a car and the other in a quiet room; run Normalize on the result if that bothers you.
Total length is still limited by memory. A concept album in 24-bit WAV is a desktop job. Three ten-minute AAC interviews are why this page exists.
I am not stitching on ID3 chapter marks or writing a CUE sheet. You get one MP3 that plays from start to finish in the order you dropped. If you wanted a zip of the originals instead, that is the archive tools.
How to use Merge audio
- 1Drop the first file, then add the rest in the order they should play.
- 2Check the list.
- 3Click Merge, then Download.
What it won't do
- No crossfade, no reorder handle.
- Output is MP3.
Common questions
Can I merge MP3 with WAV?
Yes. Everything is re-encoded to MP3 on the way out. You lose whatever losslessness the WAV had, which you already accepted by asking for an MP3 join.
Will the join click or gap?
Maybe. Concat does not crossfade. If the files were cut on different zeros you will hear it. Trim the edges first or use an editor for a real transition.
Is there a track-count limit?
Memory. A handful of files is the design. A hundred jingles is a script on your computer, not this tab.
Related tools
Why this one doesn't upload your file
There is no server to upload to. This page is a static file, and the work happens in your browser using the same graphics and WebAssembly code that renders every other site you visit. Your file is read from disk into memory, processed, and handed back as a download. Once the page has loaded you can disconnect from the network entirely and it keeps working. The longer explanation