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Stereo to Mono & Audio Channels

Recorded a video with the microphone on one side only? Put the sound in both ears, mix stereo to mono, or swap the sides.

Runs in your browser · No uploads

Drag & drop a video or audio file here

or

MP4, MOV, WebM, MKV, MP3, WAV, M4A, OGG or FLAC

Your files stay on your device. Nothing is uploaded.

  • Nothing leaves your device
  • No server-imposed size limits
  • No sign-up, no watermark
  • Free

How to fix one-sided audio

  1. Choose an audio or video file.
  2. Pick what to do: mix to mono, use the left or right side in both ears, or swap them.
  3. Download the fixed file; a video keeps its picture as it is.

Which option to pick

ProblemChoose
Sound only in the left ear (a lavalier or camera mic on one channel)Left in both ears
Sound only in the right earRight in both ears
Left and right are the wrong way roundSwap left and right
You want one channel for speech, a phone or a smart speakerMix to mono (and "Save as a mono file" for audio)

Good to know

  • Mixing averages the two sides, so each is half as loud and the two together never distort. If the sound is only on one side, picking that side keeps it at full volume.
  • Surround sound (5.1) can be mixed down too: all channels are averaged.
  • The sound is re-encoded at high quality; the picture of a video is copied without any change.

Your files stay on your device

Everything happens in your browser. Your files are never uploaded, and this site's security policy blocks the page from sending files anywhere.

Frequently asked questions

Does mono make the file smaller?

Saved as a mono file (one channel), an uncompressed WAV is half the size; MP3 and other compressed files get a little smaller.

Is my file uploaded?

No. Everything happens in your browser.