Process the Channels of Any Audio Online — Load an audio file and pick a channel operation: invert the phase (flip the waveform 180 degrees), swap the left and right channels of a stereo file, convert a mono file to stereo, or downmix stereo to mono. Download the result as WAV (lossless) or MP3. Everything runs locally in your browser.
Supported input: MP3, WAV, FLAC, OGG, Opus, M4A, AAC, WMA, AIFF and other common audio formats. Files are never uploaded to a server.
First use loads an ~30MB audio processing engine into the current browser. It is cached and reused afterwards, so please be patient.
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Click to select or drag and drop an audio file
Any common audio format; under 500MB recommended
Phase invert: flips the waveform 180 degrees on every channel. Useful for fixing a track where the left and right channels are out of phase.
Channel matching: after you select a file, the blue box above shows its channel layout (mono or stereo). Swap L/R and stereo-to-mono expect a stereo input; mono-to-stereo expects a mono input. Applying a mismatched operation still runs, but has no meaningful effect.
