Mono / Stereo Converter
Convert between mono and stereo — instantly
Merge stereo to mono, duplicate mono to stereo, or extract individual channels. Supports batch processing.
Drop your audio files here
or click to browse (select multiple)
MP3 · FLAC · WAV · OGG · M4A · AIFF
Files to Process
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Frequently Asked Questions
Mono audio has a single channel — the same sound comes from every speaker. Stereo audio has two channels (left and right), creating a wider, more immersive sound. Most music is recorded in stereo, while podcasts, phone calls, and some field recordings are often mono.
Common reasons include: podcast production (mono is standard for spoken word), mono compatibility checks (making sure your mix sounds good on single-speaker devices), reducing file size (mono files are roughly half the size of stereo), and PA systems that only support mono playback.
No. Converting mono to stereo duplicates the single channel to both left and right — it does not add spatial information or make the sound wider. It simply ensures the file plays correctly on stereo systems without being panned to one side.
Yes. All audio processing happens entirely in your browser using WebAssembly and the Web Audio API. Your files are never uploaded to any server. The converted file is downloaded directly to your computer. Nothing leaves your device.