Simple audio mixer · Mobile friendly

Mix audio online (simple MP3 mixer)

Ideal when you just want to merge WhatsApp audios, MP3 or M4A into a single file, without a complex waveform editor. Upload your clips, set an optional crossfade, and download one MP3.

Prefer the advanced editor (with visual waveforms)? Go to the full mixer .

Choose up to 4 audio files to mix

WhatsApp voice notes, MP3, M4A, OGG, WAV…

Audio 1 (required)

Audio 2 (optional)

Audio 3 (optional)

Audio 4 (optional)

Many Android phones don’t allow multi-select in the file picker, so you get 4 separate slots. Use only the ones you need — empty slots are ignored.

Crossfade between tracks (seconds)

0 seconds = no crossfade. 1–3 seconds usually works well for speech and music.

MP3 quality

The mix is processed on the server. You’ll see a progress page and a download link when it’s ready.

Tips for WhatsApp and mobile recordings

For WhatsApp voice notes, you can first convert them to MP3 with the audio-to-MP3 tool, and then use this simple mixer to merge several clips into one file.

A crossfade of 1–2 seconds is usually enough to avoid abrupt cuts between greetings, messages or sections of a podcast.