html-form-with-recaptcha.html

// Loading reCAPTCHA script
<script src="https://www.google.com/recaptcha/api.js" async defer></script>

<form action="https://formbold.com/s/FORM_ID" method="POST">
  <label>
    Your email:
    <input type="email" name="email">
  </label>
  <label>
    Your message:
    <textarea name="message"></textarea>
  </label>
  // Insert reCAPTCHA site key here
  <div class="g-recaptcha" data-sitekey="your recaptcha site key"></div>
  <button type="submit">Send</button>
</form>