ENPTES

Convert stereo audio to mono without uploading the file

Drop an audio file and download the same kind of file with one channel. Left and right are mixed together. The audio stays in this tab.

Runs in your browser Free No sign-up
  1. Choose file
  2. Set options
  3. Get result

Your file never leaves your device. Processed locally in your browser. Nothing is uploaded.

The left and right channels are mixed into one. WAV stays WAV and MP3 stays MP3. The length does not change. Files up to the limit shown above the drop area.

How to make a stereo file mono

1. Drop one audio file. Video and pictures are refused here. 2. Press “Convert to mono” and play the download next to the original. 3. Keep the original until the new file sounds right on a single speaker.

GustKit uses FFmpeg to mix the two channels into one and writes the same kind of file: WAV stays WAV, MP3 stays MP3, M4A stays M4A. A file that is already mono comes back as mono. The length does not change. This is not Change volume, and it does not remove noise.

One channel, not a new format

Audio converter is the page that changes WAV, MP3, M4A or OGG into another format, and it also accepts a video soundtrack. This page only changes the channel count. Use it when a phone voice memo or a field recording should sit in one speaker, or when an editor asked for a mono stem.

The audio stays in this tab

The first visit downloads FFmpeg. Later visits reuse the browser cache. Files longer than the limit on the page are refused, because the whole file is re-encoded here. GustKit does not fetch audio from a link.

How to hear the mono file before you replace the original

1. Play the download on the same device volume as the original. 2. A sound that lived only on the left or the right should now sit in the middle. 3. Keep the original until a single speaker sounds right.

The file type does not change. Audio converter is the page that switches WAV, MP3, M4A or OGG. This page only mixes the channels. Nothing is uploaded.

Frequently asked questions

Will a mono file get quieter?

The two channels are mixed, so a hard-panned sound moves to the center. A file that was already mono stays about as loud as it was.

Can I turn a video soundtrack into mono here?

Not on this page. Extract the audio first, convert that file, then add it back with Add audio to video if you need the picture.

Does the file type change?

No. WAV stays WAV, MP3 stays MP3, M4A stays M4A, FLAC stays FLAC and OGG stays OGG.

Is the audio uploaded?

No. FFmpeg runs in this tab.

The download is the same length. Did it work?

Yes. Mono changes the channel count, not the length. A player that shows channels should say 1.

Why was a long recording refused?

The whole file is re-encoded in this tab. Trim it under the limit shown on the page, then convert that piece.