You cannot simply type with a standard English keyboard. Use a driver like Azhagi+ or the TamilNet99 layout to map your keys to the TAM encoding.
To summarize, if you need to old Tamil documents, the Elango Bharathi Tamil Font is an essential tool in your software library. elango bharathi tamil font
You cannot simply upload a .ttf file to your server without a license check. If the font is free for commercial use (check the included LICENSE.txt ), you can embed it using @font-face . You cannot simply type with a standard English keyboard