Google Fonts is a directory of free web fonts. It offers hundreds of free, beautiful, and accessible open-source fonts optimized for the web. Google’s powerful API service makes it easy to add Google Fonts to your blog in seconds. Since all Google fonts are Open Source, you are free to use and share them with clients, colleagues and friends.
Open source also means you are free customize or improve them for your own use. Google Web Fonts can be used for personal or commercial use — in print, on your computer, or on your own websites.