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

Collapse 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.