A ball bounces on a bar and a click plays at each bounce. Use the arrow keys or the buttons to nudge the audio until the click lands exactly on the bounce. Best run on the TV you want to check. Esc to exit.
What is audio sync (lip sync) delay?
Audio sync, or lip sync, is how well the sound lines up with the picture - when they drift apart, voices stop matching the speaker's lips. It is almost always caused by extra delay in the audio path: Bluetooth, a soundbar, or the TV's own picture processing. This free test plays a click on each bounce of a ball so you can hear how far off your audio is and dial in the right correction.
How to test and fix TV audio sync
- Press Start on the TV whose sound you want to check. A ball bounces on a bar and a click plays on every bounce.
- Watch and listen: does the click come before or after the ball hits the bar?
- Nudge the offset (arrow keys or the buttons) until the click lands exactly on the bounce.
- Note the delay, then set the same value in your TV or soundbar's Audio Delay / Lip Sync setting.
Audio sync FAQ
What is audio sync or lip sync delay?
Audio sync, also called lip sync, is how well the sound lines up with the picture. When they drift apart, voices no longer match the speaker's lips. It is usually caused by extra delay in the audio path, such as Bluetooth, a soundbar, or the TV's picture processing.
Why is my TV audio out of sync?
Common causes are Bluetooth speakers or headphones, a soundbar or AV receiver adding processing delay, heavy TV picture processing delaying the image, or the streaming app itself. The fix is to add a matching delay to whichever signal is early.
How do I fix audio delay on my TV?
Most TVs and soundbars have an Audio Delay, Lip Sync or A/V Sync setting. Use this test to find how far off your audio is, then enter that delay in the settings. If the audio is behind the picture, reduce picture processing or switch to Game Mode, since most delay settings can only delay audio, not advance it.
Is this audio sync test accurate?
It is a perception-based tuning aid, not a lab instrument. A web page has no sensor to measure the true delay of your speakers, so you judge the sync yourself. It is great for finding the direction and rough size of the offset and for setting your TV's own delay. An exact millisecond figure needs a sensor, such as a phone app that watches and listens, or a hardware sync meter.
Does it work on a smart TV?
Yes on modern Android TV and Fire TV browsers. Older Samsung Tizen and LG webOS browsers may not report exact timing, in which case the test still shows the direction of the offset but hides the millisecond value.
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