Fix one-sided recordings

Choose one recorded channel and copy the same sound to both left and right outputs. This does not reconstruct the original stereo positioning.

Files are processed on your device and are not uploaded to a server. Tool assets load from this site. Use is free, with no sign-in required.

SMILEON / AUDIOSIDES

Choose one recorded channel and copy the same sound to both left and right outputs. This does not reconstruct the original stereo positioning.

Accepts WAV, MP3, M4A and OGG; codec support depends on your browser.
Up to 50 MB and 20 minutes, with a 128 MB decoded-audio memory cap. Your device may need shorter recordings.
Results are PCM 16-bit WAV copies. Format and file size can differ from the source, and the copy may be larger.
A completely silent source channel cannot be applied. Output is dual mono: two identical channels.

Files are processed on your device and are not uploaded to a server. Tool assets load from this site. Use is free, with no sign-in required.

Does this restore the original stereo sound?

No. It copies one source channel to both outputs. Missing sound or spatial information cannot be reconstructed.

Can I choose a different source channel?

Yes. Inspect the waveforms and choose the channel you want. A completely silent channel cannot be used.

Do I need to upload my file?

No. Your selected file is processed in your browser. No account is required, and the original file stays unchanged.