title: Google reCAPTCHA: show only digits in recaptcha image?
body: <p>I am hoping to use Google's free reCAPTCHA service on a web form.</p>
  
  <p><a href="https://developers.google.com/recaptcha/docs/display" rel="nofollow">https://developers.google.com/recaptcha/docs/display</a></p>
  
  <p>However, I don't want the distorted letters or words to show in recaptcha images. I feel these distorted letters give visitors too much frustration, and I did read negative comments about using distorted words as the challenge. So I hope that only digits show up in recaptcha images. </p>
  
  <p>Is this something developers like us can configure and control? I googled and did not find anything I want.</p>
  
  <p>Thanks and regards.</p>