🎬 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

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