How does converting to mono combine the channels?

It averages all channels sample-by-sample into one, so both left and right content are represented in the single output channel.

Does converting mono to stereo add real stereo width?

No — it duplicates the mono channel to left and right identically, so it plays through both speakers but doesn't create genuine stereo separation.

No — the conversion happens entirely in your browser with the Web Audio API.

Convert an audio file between mono and stereo.

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Choose an audio file

Files never leave your device — this runs entirely in your browser. Output is WAV.

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1
Choose an audio file

Up to 100 MB.
2
Pick a direction

To Mono (mix channels down) or To Stereo (duplicate to two channels).
3
Download the result

Exported as a WAV file.

How does converting to mono combine the channels?: It averages all channels sample-by-sample into one, so both left and right content are represented in the single output channel.
Does converting mono to stereo add real stereo width?: No — it duplicates the mono channel to left and right identically, so it plays through both speakers but doesn't create genuine stereo separation.
Does this tool upload my audio anywhere?: No — the conversion happens entirely in your browser with the Web Audio API.