Typically, webfonts are available in EOT and WOFF formats — if you don’t know what these formats are, you can check out our “What is EOT and WOFF?“ post.
FontShop‘s webfont selection is limited to the formats that the foundries supply and is not available in TTF or SVG formats. Under many of the foundries’ licensing terms, converting fonts to other formats for web use is not allowed. Always double-check a foundry’s End User License Agreement to be sure what is and isn’t allowed.