HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>maxlength — text input</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 0.75rem; font-size: 1.25rem; color: #0f172a; }
    label { display: block; margin-bottom: 0.35rem; font-weight: 500; font-size: 0.875rem; }
    input {
      width: 100%;
      max-width: 320px;
      padding: 0.5rem 0.65rem;
      font: inherit;
      border: 1px solid #cbd5e1;
      border-radius: 6px;
    }
    .counter {
      margin-top: 0.5rem;
      font-size: 0.8125rem;
      color: #64748b;
    }
    code { background: #e2e8f0; padding: 0.1rem 0.35rem; border-radius: 4px; }
  </style>
</head>
<body>
  <h1>maxlength on &lt;input type="text"&gt;</h1>
  <label for="bio">Short bio (max 50 characters):</label>
  <input type="text" id="bio" maxlength="50" placeholder="Type here…">
  <p class="counter" id="counter">0 / 50 characters</p>

  <script>
    var bio = document.getElementById("bio");
    var counter = document.getElementById("counter");
    bio.addEventListener("input", function () {
      counter.textContent = bio.value.length + " / 50 characters";
    });
  </script>
</body>
</html>

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HTML maxlength Attribute — Text Input Character Limit