Convert an audio file to stereo
Turns a mono file into stereo by duplicating the channel. Honesty first: it does not invent spatiality, it just solves compatibility.
Your files never leave your device
How to convert to stereo
- 1
Upload the audio
Usually a mono file.
- 2
Convert
The channel is duplicated into left and right.
- 3
Download the result
Same format, now with two channels.
Why use this tool
Compatibility
Some platforms and editors require stereo tracks; this solves it.
Honesty
Duplicating a mono track creates no spatial sound: we say it instead of selling smoke.
Private
Your audio never leaves your device: ffmpeg runs inside your browser.
Real engine
ffmpeg, the industry standard, compiled to WebAssembly and self-hosted.
Frequently asked questions
Will it sound "more stereo"?
No: both channels carry the same signal, so it sounds identical (centered). It satisfies technical requirements; it does not create width.
When do I need it?
Video editors, DAWs or platforms that reject mono tracks, and old players with quirky outputs.
Does the size grow?
In lossless formats, roughly double; in MP3/M4A it depends on the bitrate.