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Web Workers allow you to run JavaScript in background threads, preventing CPU-intensive tasks from freezing the user interface. Perfect for heavy calculations, data processing, or complex algorithms.
UI stays responsive during heavy tasks
Run multiple workers simultaneously
Communicate via postMessage API
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Web Worker Demo</title>
</head>
<body>
<div class="container">
<h1>⚙️ Web Worker Demo</h1>
<p class="subtitle">Run heavy calculations without freezing the UI</p>
<div class="status">
<strong>💡 How it works:</strong> Click the button to start a heavy calculation in a background thread. The UI will remain responsive!
</div>
<div class="controls">
<button class="btn-start" id="startBtn">🚀 Start Heavy Calculation</button>
</div>
<div class="result-box" id="resultBox">
<div class="result-title">Result</div>
<div class="result-value">Click the button to start...</div>
</div>
</div>
</body>
</html>Loading preview...
new Worker(url)Create a new worker from a script file
worker.postMessage(data)Send data to the worker
worker.onmessageReceive messages from worker
worker.terminate()Stop the worker immediately