Free Audio Merger

Drop your audio files on this page and put them in order with the arrow buttons. Choose a gap or crossfade if you want one, click Merge Audio and check the preview. Then click Download to save one WAV file.

You can combine MP3, WAV, OGG and AAC files and mix them in the same merge, as long as your browser can play each type. Each clip is decoded to raw audio before joining, so different sample rates and mono or stereo files line up. The result is always a WAV file.

This merger only takes MP3, WAV, OGG and AAC files for now, and iPhone Voice Memos are saved as M4A. Convert the file to MP3 or WAV first with the Audio Trimmer, which opens M4A and FLAC files, then add the converted copy here.

Not directly. The merger saves one 16-bit WAV file named merged.wav. For a smaller file to share or upload, open it in the WAV to MP3 converter afterwards. Stereo WAV takes roughly 10 to 12 MB for every minute of sound.

Joining adds no new compression, because the result is saved as uncompressed 16-bit WAV. Clips are resampled to your browser's audio rate, usually 44.1 or 48 kHz, and 24-bit sources drop to 16-bit. Crossfades blend the overlapping sound on purpose.

Yes. The gap starts at 0 seconds, so clips play back to back with no added silence. Move the Gap between tracks slider to insert a pause of up to 5 seconds, in 0.1-second steps, between every pair of clips.

Set the Crossfade slider between 0 and 5 seconds. The end of each clip fades out while the next fades in, and the two overlap, so every join shortens the track by that amount. It can't be longer than your shortest clip. With a gap also set, the silence shrinks by the crossfade length.

Yes. Every row in the track list has up and down arrows and a trash button, and the list numbers each track and shows its length. Use Add more audio files in the side panel to put extra clips at the end.

No. The merger places clips one after another on a single track, and the only overlap is the short crossfade at each join. Putting a voice over background music needs a multitrack editor that mixes layers.

It should work in a phone browser such as Chrome or Safari, with no app to install, as long as the clips are MP3, WAV, OGG or AAC files. Recordings saved as M4A have to be converted first, as described in the M4A question above.

No count, size or daily limit is set, and you don't need an account. Every clip is held in memory while it merges, though, so several hours of audio can slow down or crash a phone tab. Split very long projects into smaller merges.

No. Your clips are decoded, joined and saved as a WAV inside this browser tab. The page does report anonymous usage stats, like how many tracks you merged and the gap and crossfade values, but never the audio or file names.