HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>formenctype Example</title>
  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 1rem;font-size:1.25rem;color:#0f172a}form{max-width:420px;padding:1.25rem;background:#fff;border:1px solid #e2e8f0;border-radius:8px}label{display:block;margin-bottom:.35rem;font-size:.875rem;font-weight:500;color:#475569}input[type=file],input[type=submit]{font:inherit}input[type=file]{display:block;width:100%;margin-bottom:.75rem}input[type=submit]{padding:.45rem .85rem;border:1px solid #cbd5e1;border-radius:6px;background:#2563eb;color:#fff;cursor:pointer}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>
</head>
<body>
  <h1>formenctype — file upload</h1>
  <form action=/upload method=post onsubmit=return!1>
    <label for=file>Choose a file:</label>
    <input type=file id=file name=file>
    <input type=submit value="Upload File" formenctype=multipart/form-data>
  </form>
  <p class=hint><code>formenctype="multipart/form-data"</code> on the submit button ensures binary file data is encoded correctly.</p>
</body>
</html>

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HTML formenctype Attribute — File Upload