Audio Mono Compatibility Checker
Choose a stereo audio file to compare its original channels with a mono sum. The analysis runs locally in your browser.
Browser-decodable stereo audio • up to 25 MB and 10 minutes • analyzed on this device
Choose a file to begin.
Frequency-band report
Mono level vs stereo average:
| Frequency-band report | Mono level vs stereo average | L/R correlation |
|---|
Your audio stays in this browser. No file is uploaded.
A QUICK WALKTHROUGH
How to use this tool
- Choose a stereo audio file your browser can decode (up to 25 MB and 10 minutes).
- Review the overall comparison and low, mid, and high frequency bands.
- Use the level and correlation results to spot cancellation when played in mono.
What is compared
The mono signal is (left + right) / 2. RMS level and normalized left/right correlation are measured for the full signal and three filtered bands: low (below 250 Hz), mid (250–4,000 Hz), and high (above 4,000 Hz). A strong negative correlation can indicate phase-related cancellation.
Interpret results carefully
This is a signal-level diagnostic, not a mastering verdict. Band filters are broad analysis filters, and codec decoding, content, and playback conditions can affect results. A mono sum can sound different even when measured levels look similar.
Local processing and limits
The selected file is decoded and analyzed in this browser and is not uploaded. Files must decode to stereo; files over 25 MB, 10 minutes, 96 kHz, or 2 million frames are not analyzed. Format support depends on your browser.
GOOD TO KNOW
Common questions
Does the tool change my audio?
No. It only analyzes decoded samples and does not create or modify an audio file.
What does negative correlation mean?
It means the channels tend to move in opposite directions over the measured signal or band, which can reduce level when summed to mono.
Is my file uploaded?
No. Decoding and analysis happen locally in your browser.