Its very easy and simple to type in Nagari (Nagari/DevNagari/DebNagari/Hindi Typing) using English. Just type the text in English in the given box and press space, it will convert the text in Nagari script. Click on a word to see more options. To switch between Nagari and English use ctrl + g. Now copy the text and use it anywhere on emails, chat, facebook, twitter or any website.
Type in Nagari (Press Ctrl+g to toggle between English and Nagari)