Turn standard live chat messages into real-time, flying comments on your video player. Lightweight, performant, and customizable.
Download from GitHubPowered by HTML5 Canvas and GPU acceleration. It renders smooth 60fps animations without slowing down your browser, even with thousands of messages.
Change fonts, sizes, opacity, speed, and display area. Supports multilingual fonts including Chinese, Japanese, Korean, and Thai.
Runs entirely locally on your browser. No data is collected, no external servers involved. Your chat data stays between you and YouTube.
Youtube Livechat Danmaku Helper uses MutationObserver to efficiently monitor the chat stream in the background. It then projects these messages onto a transparent Canvas layer overlaid on the video player, synchronized with your playback.
The extension uses a unique "Iframe Relay" architecture to securely bridge the chat window and the main player, ensuring compatibility with all YouTube layouts.