http://onlinefontconverter.com

select formats: ttf, woff, eot, svg

Sample CSS code:

@font-face {
  font-family: 'PT Sans';
  font-style: normal;
  font-weight: 400;
  src: local('PT Sans'),
  local('PTSans-Regular'),
  url('../fonts/PT_Sans-Web-Regular.eot?#iefix') format('embedded-opentype'),
  url('../fonts/PT_Sans-Web-Regular.woff') format('woff'),
  url('../fonts/PT_Sans-Web-Regular.ttf') format('truetype'),
  url('../fonts/PT_Sans-Web-Regular.svg#PTSans-Regular') format('svg');
}