Write or paste HTML on the left — live preview renders on the right. Scripts run inside a sandboxed iframe.

HTML Editor

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <style>
    body { font-family: sans-serif; padding: 24px; background: #f8f9fa; color: #1e293b; }
    h1 { color: #4f46e5; margin-bottom: 8px; }
    p { color: #475569; margin-bottom: 16px; }
    .card { background: white; padding: 20px; border-radius: 10px; box-shadow: 0 2px 10px rgba(0,0,0,0.08); margin-bottom: 16px; }
    button { background: #4f46e5; color: white; border: none; padding: 10px 20px; border-radius: 6px; cursor: pointer; font-size: 14px; }
    button:hover { background: #4338ca; }
    .counter { font-size: 32px; font-weight: 700; color: #4f46e5; margin: 12px 0; }
  </style>
</head>
<body>
  <h1>Hello, HTML Viewer!</h1>
  <p>Edit the HTML on the left to see a live preview here.</p>

<div class="card">
    <p>JavaScript works too — try clicking the button:</p>
    <div class="counter" id="count">0</div>
    <button onclick="document.getElementById('count').textContent = ++n">Click to count</button>
  </div>

Preview