What does Mono Stereo Converter do?
Mono Stereo Converter changes channel layout. Stereo to mono averages the left and right channels. Mono to stereo copies one signal into both channels. That copy does not create real stereo separation or recover a missing side. The page shows the channel count, duration and sample rate this browser can detect.
How to use Mono Stereo Converter
- 1Upload an audio file.
- 2Read the detected channel count, duration and sample rate.
- 3Choose stereo to mono or mono to stereo.
- 4Export MP3, WAV or M4A. Cancel stops the local job.
Supported inputs and outputs
Inputs
Local audio with one or two channels
Outputs
MP3, WAV or M4A in the selected channel layout
Practical uses
- Making a mono voice-over from a stereo file
- Duplicating a mono track for a player that expects two channels
- Checking the detected channel count before export
Browser and media limitations
- Mono to stereo duplicates the signal. It does not create true stereo width.
- Stereo to mono mixes both channels together, so the original separation is not kept.
- The export re-encodes the sound.
- A browser that cannot detect the channel count still exports the layout you chose.
How local processing works
Your media is processed in this browser tab, not uploaded to a processing server. The media engine downloads on first export. Page navigation and analytics still use network requests. Download the result before closing the tab.
Frequently asked questions
Does mono to stereo create a stereo image?
No. Both output channels carry the same signal. It does not invent a left and right difference.
What happens to a stereo file in mono-to-stereo mode?
The file is mixed to one signal first, then that signal is copied to both channels.
Which formats can I download?
MP3, WAV and M4A.
Is the recording uploaded?
No. Channel inspection and export stay in this browser tab.