Validation image | captcha image
![Validation image | captcha image](/web-applications/web-services/web-forms/validation-image-captcha-image-160553.jpg?v=1x248x64)
Place a form validation image to block robots or abusers from abusing web forms. This web services presents a captcha image to the user, the captcha image shows a simple four digit number that the form user has to enter as a validation before a form is submitted.