Video & Audio
Merge Audio
Join up to 20 sound files into one, in the order you choose. No upload, no signup.
Files stay on your device How it works
Drop files here, paste, or
MP3, M4A, AAC, WAV, OGG, FLAC or WebM · up to 20 files, 25 MB each
Your files
Your file is ready
How to merge audio files
- Choose 2 to 20 sound files, MP3, M4A, AAC, WAV, OGG, FLAC or WebM, each up to 25 MB, up to 30 minutes long in all.
- Put them in order with the arrows beside each file. The merged file follows the list from top to bottom.
- Leave the format as it is, or pick one. Then press Merge audio and download the result, named after the first file: podcast-episode.mp3 gives podcast-episode-merged.mp3.
Copied when the files match
When every file has the same format and settings, as recordings from one app or recorder usually do, the sound is copied into that format. Nothing is re-encoded and nothing is lost, so several MP3s become one MP3, and WAVs one WAV. The note under the result says whether the sound was copied.
Made anew when they don’t
Otherwise each file is decoded, brought to 48 kHz, in stereo if any file is stereo, and saved as M4A (AAC) at 160 kbit/s. A browser that can’t make AAC, such as Firefox, makes OGG (Opus) instead. You can also choose the format yourself: M4A, WAV or OGG. A chosen format re-encodes every file, even those already in it. WAV holds sound uncompressed, so a WAV here can be up to 10 minutes long in all.
Why there’s no MP3
Browsers can’t make MP3 files themselves. The add-on MP3 encoders available for browsers are built on LAME, and its license, the LGPL, isn’t one this site uses in its tools. Copying needs no encoder, which is why matching MP3s still become one MP3.
Which browsers work
Copying works in current Chrome, Edge, Firefox and Safari, because nothing is converted. Making the sound anew uses your browser’s own decoder and encoder: a current Chrome, Edge or Firefox, or Safari 26 or later. Firefox can’t make M4A, so choose WAV or OGG there.
Good to know
Your files stay on your device; nothing is uploaded. Each file starts where the one before it ends, with no pause added. If a file can’t be read, the tool names it and makes nothing. This tool joins files into one: to cut a file down before you merge, use Trim Audio, and to change files’ format without joining them, use the Audio Converter.