#55 · Browser Audio Tool

Microphone Channel Checker

Record a short microphone sample and verify whether its left and right channels carry useful signal.

Check microphone channels

Grant microphone access when prompted
No audio selected
Choose an audio file to begin.
Audio is processed locally in your browser and is not uploaded.
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How to use Microphone Channel Checker

  1. Set the recording length and allow microphone access.
  2. Adjust the tool-specific controls, then select the main action button.
  3. Review the measured result, listen to the preview, and download the new file if useful.

What this audio tool does

The checker records a fresh microphone sample, decodes it, compares per-channel RMS and peak levels, and saves the captured sample.

Channel status is calculated from actual samples. Mono devices are identified instead of being presented as stereo.

Browser and operating-system audio routing can downmix a stereo microphone to mono before this page receives it.

Supported formats and limits

Input decoding depends on Web Audio support in the current browser. Output is WAV unless this converter explicitly uses a browser-verified MediaRecorder codec.

StageDetails
InputBrowser-decodable audio, up to 600 MB
ProcessingLocal Web Audio sample data
OutputNew Blob with a matching MIME type

Example and practical tips

Try microphone channel checker on a short copy first, listen for artifacts, and then process the full recording. Cleaner input produces easier-to-read results.

  • Close other audio-heavy tabs while processing.
  • Keep the source file until you have checked the download.
  • Reset before testing a different recording.

Frequently asked questions

How do I check whether my microphone is stereo?

Microphone Channel Checker uses the option shown above and real decoded audio data, so the best setting depends on the recording rather than a fixed preset.

Why does my stereo microphone appear as mono?

Browser audio capabilities vary. The page checks the required decoder or encoder and shows a specific error when it is unavailable.

What channel difference indicates a problem?

The calculation is based on samples from the selected or recorded audio, not on the filename or a simulated result.

Does the microphone sample leave my browser?

Processing stays in this browser tab. Object URLs and decoded buffers are released when you reset or leave the page.

Why was microphone permission denied?

Use a clean source, preview the result, and adjust the available controls if the first pass is not a good fit.

Processing details

PrivacyLocal browser processing
Core methodChannel status is calculated from actual samples. Mono devices are identified instead of being presented as stereo.
PriorityB

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