You can type in Hindi font without the use of hindi font keyboard (Keypad) by using online tools from Google at google.co.in/transliterate/indic/ . The other website which gives the same facility is Quillpad at quillpad.in/hindi/ .
This tool automatically convert the English word you type in English to Hindi font, The conversion process is quite advance, the converted Hindi font is most accurate in these websites. It also gives option to choose correct hindi word if there will be any doubt about what to type.
After getting Hindi sentence from these websites, you can copy and paste it to any other place, it will be always in Hindi font. I have also written about Translate any English webpage into Hindi webpage by Google