Sync your Audio
on YouTube
Bluetooth latency makes YouTube impossible to watch. LagSync fixes the delay at the engine level for perfect lip-sync.
YouTube uses adaptive streaming (DASH) and may switch audio codecs or bitrates mid-playback. Those switches can cause brief jitter or perceived sync shifts.
Last updated: 4/7/2026
Quick Setup Guide
Install & Pin
Add LagSync to your browser and pin it to your toolbar for quick access while watching.
Play YouTube
Open any video on YouTube. LagSync will automatically detect the video engine and prepare the hook.
Slide to Sync
Open the popup and move the slider. Your audio will shift in real-time until it fits the video perfectly. You could also use our built in latency tester.
Practical Tips
YouTube uses adaptive streaming (DASH) and may switch audio codecs or bitrates mid-playback. Those switches can cause brief jitter or perceived sync shifts.
- Lock playback quality in the player (gear → Quality) to avoid mid-stream codec/bitrate swaps.
- Start with a fixed preset around 180 ms and adjust in 20–50 ms increments until lip-sync looks correct.
- For music, podcasts, or dialog-heavy content, enable the extension's Audio Mode so audio timing is prioritized.
- If sync jumps after ads or quality changes, disable the extension's auto-settings so it doesn't re-tune mid-playback.
- For consistent testing, use a short clip with steady audio (no scene cuts) and adjust there.
LagSync v1.2.1 — Available Now
LagSync v1.2.1 is available now on Chrome, Firefox, Brave, and Edge. Safari support is coming soon.