Online Audio Phase Correction Tool
Inverting the polarity turns a waveform upside down: every peak becomes a dip. On its own that is inaudible, but it decides whether two signals reinforce or cancel each other when they are combined.
What Can the Phase Inverter Do?
- Invert left, right or both: each channel has its own switch.
- Mono check: listen to the two channels summed, which is where phase problems become audible.
- Phase meters: one for the whole signal and one for the bass below 150 Hz, updated as you flip the switches.
- Export: download the result as a stereo or mono WAV at the original sample rate.
When Does Inverting Help?
It helps when one channel is the wrong way round: a cable wired in reverse, a microphone pointing at the back of a drum, a stereo file whose sides cancel in mono. You recognize the problem by a sound that is hollow, thin in the bass or strangely wide, and by a meter below zero. Flip one channel, switch on the mono check and compare: if the sound becomes fuller and the meter turns positive, keep it. Inverting does not repair timing differences between two microphones; it can make them better or worse, and only moving one of the tracks in time fixes them properly. Inverting both channels of a file changes nothing you can hear, but it matters when the file is combined with other tracks later.
Who Is It For?
Mixing engineers and home recordists with multi-microphone recordings, podcasters whose two-sided recording sounds thin on a phone, and producers checking samples and stereo effects for mono compatibility. To turn the corrected file into mono, use the Stereo to Mono Converter; the background is in What Is Phase Cancellation? (And How to Fix It).