You can use our Serial Monitor to talk to your Arduino device from your browser. Just add our browser plugin if you haven't installed it already, select the correct Port and Speed, and click Connect.
You can also embed the Serial Monitor section in your own website! Just use this HTML code.
<iframe style="height: 510px; width: 100%; margin: 10px 0 10px;" allowTransparency="true" src="https://codebender.cc/embed/serialmonitor" frameborder="0"></iframe>