LagSync Documentation

Install

1. Open the Chrome Web Store listing for LagSync.
2. Click Add to Chrome (also works in Brave and Edge).
3. Pin the extension to your toolbar for fast access while watching video.

Basic Usage

• Play a video on your target site (YouTube, Netflix, Twitch, Prime Video, etc.).
• Open LagSync and set a delay preset as a starting point.
• Fine-tune in small steps until lip-sync looks natural.
• For dialog-focused content, enable Audio Mode when needed.

Keyboard Shortcuts

You can adjust sync delay on the fly without opening the popup:

• Enable Keyboard Shortcuts in the LagSync Settings menu.
• Press Shift + . (Period) to increase delay.
• Press Shift + , (Comma) to decrease delay.

Tip: You can change the jump size (for example 10 ms vs 50 ms) in extension settings.

Troubleshooting

• Black Screen or Flickering Video: If a web player goes black or flashes when you enable LagSync, disable Hardware Acceleration in your browser settings and restart the browser.
• Drift Over Time: On DRM-heavy sites (like Netflix or Prime), if audio drifts after an hour of watching, pause and seek a few seconds forward/backward to force the player to resync.

Advanced Settings

• Audio Mode vs Video Mode: By default, LagSync delays the video to match lagging Bluetooth audio. Audio Mode flips this behavior natively, which is sometimes required by strict DRM players.
• Auto-Settings: When enabled, LagSync automatically detects the best underlying pipeline (MSE vs Canvas) for the specific video player you are watching to prevent errors.

Guides

Use per-site guidance for the best results:

Versioning

LagSync currently has two public releases (1.0 and 1.01). This documentation and the changelog will grow over time as new versions are shipped.