Lip Sync Test
A visual marker reaches the centre every two seconds while a short beep plays. Adjust the sound until it seems aligned. The result is your applied compensation, not an automatic measurement of device latency.
Browser rendering, audio buffers, attention and perception affect alignment. It cannot diagnose a TV pipeline, measure HDMI latency automatically or guarantee the same timing in a different app. Hidden tabs stop playback.
Status: Ready
- Sound timing adjustment
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Comparison
A visual marker reaches the centre every two seconds while a short beep plays. Adjust the sound until it seems aligned. The result is your applied compensation, not an automatic measurement of device latency.
The test uses local graphics and generated audio. No microphone, camera, recording or result upload is required; saved comparisons remain in page memory.
Lip Sync Test is a free, browser-based audio testing tool that lets you check audio and video sync with a moving marker and quiet beep.
- Cost: Free, no signup
- Install: None — runs in the browser
- Privacy: Runs locally, no uploads
- Platforms: Windows, macOS, Linux, Android, iOS
- Time: Under a minute
Lip Sync Test
How to use this test
A visual marker reaches the centre every two seconds while a short beep plays. Adjust the sound until it seems aligned. The result is your applied compensation, not an automatic measurement of device latency.
Browser rendering, audio buffers, attention and perception affect alignment. It cannot diagnose a TV pipeline, measure HDMI latency automatically or guarantee the same timing in a different app. Hidden tabs stop playback.
Tool FAQ
Common questions
