Stereo Channel Tester
Test your left and right audio channels. Play a tone, adjust its pitch and run an automatic channel check.
How do I check whether left and right audio channels are correctly routed?
Start at low device volume, select the left or right channel, and listen for the matching speaker or headphone side. The automatic sequence plays left, right, then both for two seconds each. Adjust the signal frequency or level as needed.
Check your channels
Left · Right · BothBegin with a low device volume. Use stereo headphones or speakers; mono output, accessibility settings, or audio routing may combine channels.
Signal routing
Sine waveChoose a channel and start the test.
The sequence plays each routing for two seconds, then stops. A continuous test stops after 15 seconds. Frequency and level can be changed while the signal plays.
Three simple steps
How to use Stereo Channel Tester
Lower your device volume and select a channel or automatic sequence.
Listen for the expected side and adjust frequency or level if useful.
Stop immediately or let the built-in timer end the signal.
Common questions
Good to know
Understand the result.
Keep the original.
Is this tool free, and are my files uploaded?
This tool is free with no account required. The work happens in your browser. Your input and files are not sent to a processing server.
What are the limits and details?
Mono output, device settings, wireless processing, and browser routing can combine or alter channels. This checks playback routing and is not a hearing test or calibrated equipment measurement.
Limits: sine tones from 100 to 2,000 Hz. The automatic sequence lasts six seconds; a continuous test stops after 15 seconds.