Audio Channel Converter

Changes how many channels an audio file has: stereo (2 channels) or mono (1 channel).

What it does

Use this to shrink podcast and interview archives by going mono, or to up-convert mono voice-overs so pro editing software accepts them.

You get one channel-converted copy per input.

Mono (1 channel): A single audio channel. For speech recordings, podcasts, interviews. File size drops by roughly half.
Stereo (2 channels): Two channels (left and right). For music, ambience, professional audio editing.

Shrink a podcast archive: Add the stereo podcasts, target Mono, run. Files halve in size, speech quality stays fine.

Mono-ify interview recordings: Add the stereo interviews, target Mono, run. Saves storage.

Promote mono voice-over to stereo: Add the mono files, target Stereo, run. Pro software opens them happily.

Simplify a dual-channel field recording: Add the stereo field files, target Mono, run.

Going stereo to mono mixes left and right together. If the channels carry different content (e.g. two speakers on separate channels) they merge.
Going mono to stereo copies the same audio to both channels, you do not get real stereo separation.
Going mono on music loses the stereo image and lowers quality.
The conversion is one-way, keep the original.
The same target applies to every file in the batch.

Free tier has a monthly channel-convert cap. Office plan removes it.