Mono to Stereo Converter
Convert single-channel mono audio into dual-channel stereo. Upgrade mono recordings for stereo DAWs, video editors, and playback compatibility.
Drop your audio file here
or
Supports MP3, WAV, FLAC, AAC, OGG · Max 200 MB
How it works
Upload your mono file
Drop any mono audio file — MP3, WAV, FLAC, OGG, AAC. Processing is entirely local to your browser.
Duplicate to two channels
The mono channel data is copied identically into both left and right channels of a new stereo AudioBuffer.
Download your stereo WAV
Get a 16-bit PCM stereo WAV at the original sample rate. Compatible with all DAWs and players.
Frequently asked questions
Why convert mono to stereo?
Some video editors, DAWs, and broadcast systems require stereo tracks. Converting mono to dual-mono stereo makes your audio compatible with stereo-only workflows without altering its content.
Is this true stereo or dual mono?
This tool creates dual-mono stereo — both channels are identical. True stereo requires separate left/right recordings. Dual-mono is perfectly compatible with stereo systems and is the standard upgrade path from mono.
Will I get a wider soundstage?
No. Because both channels are identical, the audio will play dead-center in the stereo field. To widen the sound you'd need to add stereo effects in a DAW after conversion.
Is my audio uploaded to a server?
No. Everything runs in your browser via the Web Audio API. Your audio never leaves your device.
What if I upload a stereo file?
The tool will still work — it reads the first channel and duplicates it to both channels, effectively converting to dual-mono. For a truly stereo pass-through, no processing is needed.