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The following sample form will allow you to encode and decode URLs using java script:

Paste your URL here

Source code:

<script type='text/javascript'>

  function encode()
  {
    document.getElementById('textArea').value = encodeURIComponent(document.getElementById('textArea').value);
  }

  function decode()
  {
    document.getElementById('textArea').value = decodeURIComponent(document.getElementById('textArea').value.replace(/\+/g,  " "));
  }

</script>

Don’t forget to replace textArea with the ID of your text area.
The above code is similar to the PHP function urldecode.