Convert Stereo to Mono Audio Free
Downmix stereo or multi-channel audio tracks into single-channel mono to cut file size.
- 100% free
- Files stay on your device
- No sign-up, no watermark
Choose files or drag & drop
Upload MP3, WAV, OGG, M4A, WEBM, FLAC, AAC files to convert locally inside your browser.
What is Stereo to Mono Audio converter?
Fix recordings where the speaker only appears in the left or right earphone. Our mono converter mathematically sums and balances both channels equally (Left + Right / 2), producing a centered mono sound that plays evenly in both ears.
How to use Stereo to Mono Audio converter
- 1
Add your file or input
Choose a supported file, drag it onto the upload area, or type/paste the data this tool works with.
- 2
Adjust the options
Pick the output format, quality, size or other settings the tool offers. Defaults work well for most files.
- 3
Process and download
Run the tool and save the result. Processing happens in your browser, so nothing is uploaded to a server.
Frequently asked questions
Why do some smartphone or mic recordings only play in one ear?
Many external microphones record on channel 1 (Left) leaving channel 2 (Right) blank. Converting to mono copies the active signal to both channels, restoring balanced listening on headphones.
Does converting stereo to mono cut file size?
Yes! Storing one acoustic channel instead of two cuts uncompressed audio bitrates exactly in half, delivering immediate file size savings.
Can I select just the Left channel or just the Right channel?
Yes. You can choose to sum both channels or isolate the Left or Right channel exclusively if one side contains background noise.
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