Mono playback is cleaner on a single speaker (phone, voice recordings, podcast episodes that were stereo-tracked by accident), and the file size drops by roughly 50 percent.

Will it sum-cancel vocals?

No — Average and Sum modes preserve the center. For vocal removal, use the vocal remover instead, which subtracts L from R.

Average mode attenuates 6 dB so clipping is almost impossible. Sum mode can clip if both channels already peak near 0 dBFS.

Stereo to Mono Converter

Stereo to Mono ConverterLocal

inputstereo-to-monooutputCollapse stereo files to mono. Pick how the channels combine, preview the result, and export as MP3 or WAV.

Drop an MP3 or WAV file here

or click to browse

⎆Your audio never leaves your browser. The conversion runs locally via the Web Audio API.