🎬 Synchronize YouTube Playback Between Multiple Computers

Synchronize YouTube Playback Between Multiple Computers is a Chrome extension that allows real-time synchronization of YouTube video playback across multiple computers.

One machine acts as the Host – having full control over the video.
The other machines are Clients – automatically following the Host's actions with almost no delay.

No need to log into a shared YouTube account.
No need to install additional software.
Just open YouTube and watch together.

🚀 Main Features

▶️ Sync Play / Pause

• When the Host plays or pauses the video
  → All Clients will play or pause simultaneously

⏩ Sync Seek

• The Host can seek to any point in the video
  → Clients will immediately jump to the correct timestamp

⏱ Sync Playback Time

• Automatically adjusts for slight playback time discrepancies
• Keeps the video in sync across machines

👑 Full Control by Host

• Only the Host can control the video
• Clients cannot disrupt the synchronization

🌐 Works Directly on YouTube

• No intermediary pages
• No iframes, no video proxies
• Runs directly on youtube.com

⚡ Low Latency – Stable

• Only transmits video playback events (play, pause, seek)
• Does not transmit video data → lightweight, fast, bandwidth-efficient

🧩 Simple – Lightweight Interface

• No clutter
• Easy to use even for non-technical users

🧠 How It Works

1. Open a YouTube video on the computers
2. Select one machine as the Host
3. The other machines select Client and connect

4. From that point on:

   • Host plays → Clients play
   • Host pauses → Clients pause
   • Host seeks → Clients seek along

All changes are synchronized in real-time.

🎯 Practical Use Cases

• 👨‍👩‍👧‍👦 Watching YouTube with family or friends remotely
• 🎓 Online learning, teaching, watching lectures in sync
• 🧑‍💼 Presenting videos in group meetings, product demos
• 🖥 Setting up multiple screens to play the same content
• 🌍 Remote teams watching training videos together

🔒 Privacy & Security

• ❌ No personal data collection
• ❌ No user tracking
• ❌ No access to content outside of YouTube
• ✅ Only processes necessary video playback events for synchronization

The extension does not save viewing history, does not interfere with YouTube accounts.

⚙️ System Requirements

• Google Chrome or a Chromium-based browser
• Video opened on <