Check sound delay and audio/video sync with a repeating beep and flash. Adjust the flash until both events feel simultaneous.
β
Press Start to begin
If the beep arrives after the flash, move the slider right until they match.
Flash earlierFlash later
Matched result
Estimated sound delay: about 160 ms
This is a perceptual audio delay test, not laboratory measurement. Your result includes browser, operating-system, wireless-device, and personal reaction differences.
How to Read Your Audio Delay Test
1
Start the pulses
Use a comfortable volume and watch the flash while listening for each short beep.
2
Match sound and flash
If sound arrives late, move the flash to the right until both events feel simultaneous.
3
Compare connections
Repeat with wired, Bluetooth, speaker, or TV output to find where delay is introduced.
More Audio Testing Tools
Use these checks to separate latency problems from channel or hardware issues.
Audio latency is the delay between an event happening and you hearing its sound. The browser, operating system, audio driver, wireless connection, and playback device can all add delay.
How does this audio latency test work?β
The test repeats a short beep and a visual flash. Move the flash-delay control until the two events feel simultaneous. The selected value is a practical estimate of the sound delay in your current setup.
Can this test check Bluetooth audio delay?β
Yes. Run the test once with wired headphones or speakers and again over Bluetooth. If the Bluetooth result needs more flash delay to match, the wireless path is adding noticeable latency.
Is the result a laboratory measurement?β
No. This is a manual perceptual sync test. It is useful for troubleshooting and comparison, but exact round-trip measurement requires dedicated recording hardware or a calibrated microphone loopback.
How can I reduce audio and video sync problems?β
Try a wired connection, disable extra audio processing, select a low-latency or game mode, update audio drivers, and check whether the player or TV offers an audio-sync adjustment.