Mono to Stereo Converter

Switch a track between mono and stereo. Convert a single-channel file to stereo so it plays on both sides, or fold a stereo file down to mono, then export as MP3 or WAV. A quick fix for one-sided audio.

Read the guide: How to Convert Mono to Stereo
Drop an audio file here, or

How it works

  1. 1

    Add an audio file

    Drop in an MP3, WAV, OGG or M4A file. The tool shows whether it is mono or stereo.

  2. 2

    Choose the layout

    Pick stereo to play on both channels, or mono to blend everything into one.

  3. 3

    Export the result

    Preview it, then save the converted file as MP3 or WAV.

Instant & 100% private — nothing is uploaded

Everything runs locally in your browser. Your files are processed on your own device and are never sent to a server, so there are no upload waits, no size limits from us, and nothing is ever stored or logged.

Frequently asked questions

How do I convert mono audio to stereo?
Add the file, choose Stereo, and download. The single channel is copied to both the left and right sides so it plays evenly through both speakers or earbuds, instead of only one.
Why does my audio only play in one ear?
That usually means the file is mono being sent to one side, or a stereo file with sound only on one channel. Converting to stereo here copies the audio to both channels so it plays in both ears.
Can I convert stereo to mono as well?
Yes. Choose Mono and the left and right channels are blended into a single channel. That is useful for voice recordings, smaller files, and playback on single-speaker devices.
Is it really free, and is there a watermark?
It is free and there is no watermark, no sign-up and no email wall. You get the full-quality file straight back, with nothing added and nothing held behind a paywall.
Is my file uploaded to a server?
No. Everything runs locally in your browser. Your file is read and processed on your own device, nothing is uploaded, and nothing is logged or stored.

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