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Convert Audio Channels

Mix stereo into mono, keep only the left or right channel, or duplicate mono into two identical channels. Preview waveforms and download a checked WAV.

Processed on your deviceFree · No account needed

Preparing your tool…

How to use it

  1. Load one mono or stereo audio file or the synthetic stereo example.
  2. Choose mono mix, left, right or, for mono input, duplicate channels.
  3. Create the WAV, compare the result and download the checked file.

Example: left contains +0.5 and right −0.5 at the same sample. Their mono average is zero; selecting left retains +0.5.

Details & limits

Audio up to 20 MiB / 60 seconds; one mono/stereo track at 8–96 kHz. PCM 16-bit WAV. Sample rate and duration retained. Duplicating mono does not recreate spatial stereo; opposite-phase signals can cancel when mixed.

Can this recover true stereo from an old mono recording?

No. Duplicating mono writes the same samples into two channels. It meets a channel-count requirement without inventing stereo separation or reconstructing missing audio.

Choose the channel you actually need

A stereo recording may contain speech on only one side or separate signals on its two channels. Choose left or right to retain that channel unchanged as mono. The mono mix calculates (left + right) ÷ 2 for every sample, avoiding an automatic doubling of level. Opposite-phase signals can cancel, so review the calculated mix waveform and listen before sharing. A mono source can be copied into two identical channels for software that expects stereo, but this creates no new spatial information. Duration and sample rate stay unchanged; the checked download is uncompressed 16-bit WAV.

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