HTML Code
<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>enctype comparison</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}h2{margin:1.5rem 0 .75rem;font-size:1rem;color:#0f172a}form{max-width:420px;padding:1.25rem;background:#fff;border:1px solid #e2e8f0;border-radius:8px;margin-bottom:.5rem}label{display:block;margin:.65rem 0 .25rem;font-size:.875rem;font-weight:500;color:#475569}label:first-of-type{margin-top:0}input{width:100%;box-sizing:border-box;padding:.45rem .6rem;border:1px solid #cbd5e1;border-radius:6px;font:inherit}input[type=submit]{width:auto;margin-top:.75rem;cursor:pointer}.badge{display:inline-block;margin-bottom:.5rem;padding:.15rem .5rem;background:#e0f2fe;color:#0369a1;border-radius:4px;font-size:.75rem;font-weight:600}.status{margin-top:.5rem;font-size:.8125rem;color:#64748b;min-height:1.25rem}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>
</head>
<body>
  <h1>enctype — default vs multipart</h1>

  <h2>Text form (default encoding)</h2>
  <span class=badge>application/x-www-form-urlencoded</span>
  <form id=textForm method=post action=/submit>
    <label for=name>Name:</label>
    <input id=name name=name placeholder="Jane Doe">
    <input type=submit value="Submit text">
  </form>
  <p class=status id=textStatus></p>

  <h2>File upload form</h2>
  <span class=badge>multipart/form-data</span>
  <form id=fileForm method=post action=/upload enctype=multipart/form-data>
    <label for=file>Choose a file:</label>
    <input type=file id=file name=file>
    <input type=submit value="Upload file">
  </form>
  <p class=status id=fileStatus></p>

  <script>document.getElementById("textForm").addEventListener("submit",(function(e){e.preventDefault(),document.getElementById("textStatus").textContent="Default enctype sends fields as name=value pairs (URL-encoded)."})),document.getElementById("fileForm").addEventListener("submit",(function(e){e.preventDefault(),document.getElementById("fileStatus").textContent="multipart/form-data is required so binary file data is sent correctly."}))</script>
</body>
</html>
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HTML enctype Attribute — URL-Encoded vs Multipart Forms
