title: UTF-8 encoding validator online
body: <p>Hello I would like to test an URL encoding in UTF-8 Is there some online tools to do that?
  The closest I have found is in <a href="https://stackoverflow.com/questions/115210/utf-8-validation">this question</a> which finally suggest to test on the client side using GNU. </p>
  
  <p>note: I need to do that by code. Like sending the chars to enconde on a GET petition.</p>