What does a phase correlation value mean?

+1 means left and right are fully in phase, 0 is mostly uncorrelated, and negative values indicate increasing anti-phase behavior that can collapse in mono.

Can this meter detect mono compatibility issues?

Yes. The tool reports negative-correlation time and mono fold-down loss so you can quickly spot cancellation risk before delivery.

Does my audio upload to a server?

No. Audio decoding and analysis run locally in your browser session.

Audio Phase Correlation Meter (Free Browser Tool)

Correlation Instrument Stereo phase + mono risk

Standby

01 — Signal Intake

Drop stereo audio

WAV, AIFF, MP3, M4A, AAC or FLAC. Analysis runs locally in your browser.

Select File

Source—

Duration—

Sample Rate—

Channels—

02 — Average Correlation-1 to +1

— CORR

Awaiting stereo signal

-1.00.0+1.0

Average—

Negative Time—

Minimum—

Maximum—

03 — DiagnosticsWidth + Mono

Minimum Corr—

Maximum Corr—

Negative-Corr Time—

Side / Mid Energy—

Mono Fold-down Delta—

Window Size—

04 — Correlation over time

Orange trace = frame-by-frame correlation history

Correlation is computed over short sliding windows. Use this tool as a fast preflight check before mastering, broadcast, or live playback delivery.

Features

Correlation Meter — Fast readout from -1.0 (anti-phase) to +1.0 (fully in phase).
Mono Risk Checks — Negative-correlation time and mono fold-down delta for cancellation awareness.
Stereo Width Insight — Side-versus-mid energy estimate for practical mix translation decisions.
Time History Graph — Spot problematic sections instead of relying on one global average number.
Private Browser Workflow — Files are processed locally on your machine.

Frequently Asked Questions

What values are generally safe for mono compatibility?

Values near +1 are strongest for mono translation. Values around 0 can be usable but should be checked in context. Sustained negative values often indicate cancellation risk when folded to mono.

Can I use this on stems and live playback files?

Yes. It is useful for stems, backing tracks, full mixes, and mastering checks before delivery.

Does this replace dedicated mastering metering plugins?

It is designed as a fast and practical browser preflight meter. Dedicated plugin suites can provide deeper multiband and real-time session analysis.