Intenso

To add your custom font do the following:

1. Save the font files to the following folder (include all the available versions of the font, like .eot, wof, .ttf and .svg)
   
   skin/frontend/intenso/default/fonts/
2. Open the custom.css file of the theme and add the following content:
   

   @font-face {
       font-family: YourCustomFontName;
       src:url("../fonts/yourcustomfontname.eot");
       src:url("../fonts/yourcustomfontname.eot") format("embedded-opentype"),
           url("../fonts/yourcustomfontname.wof") format("woff"),
           url("../fonts/yourcustomfontname.ttf") format("truetype"),
           url("../fonts/yourcustomfontname.svg") format("svg");
       font-weight: normal;
       font-style: normal;
   }
   
   /* font family */
   body,
   h1,h2,h3,h4,h5,h6,p, .top-bar-section, .top-bar-section ul li > a,
   .side-nav, .side-nav li.active > a:first-child:not(.button), button,
   .button, .label, .sub-nav dt, .sub-nav dd, .sub-nav li, .chosen-container,
   .rating-links.icon-user > span, .newsletter-ribbon .icon-email,
   .footer-links li[class^="icon-"], .footer-links li[class*=" icon-"],
   .layered-nav-container ol li, a.previous, a.next {
       font-family: YourCustomFontName, sans-serif;
   }
   .links-list {
       font-family: YourCustomFontName, sans-serif !important;
   }
   @media only screen and (min-width: 40.063em) {
       .top-bar-section .left ul,
       .top-bar-section .left .arrow-box {
           font-family: YourCustomFontName, sans-serif !important;
       }
   }

3. Save the file, refresh Magento cache and your browser’s cache

For more information about how to enable and edit the custom.css file of the theme please refer to this article.