TypeWonder is a free service that allows you to experiment with different types of Google Fonts in real-time.
Just enter the URL of the site you want to preview, click “Go!” and you are set. You can change the font easily and as many times as you like.
Once you are happy with the result, click the “Get Code” button (top right), choose the style(s) and character sets, and follow instructions.
However, you may also want to request feedback from your audience or friends before implementing the font on your site. TypeWonder lets you share the link to the preview page on Twitter or by email.
Note that you can also test fonts directly from your browser thanks to the Chrome, Firefox, and Safari extensions.
To start using TypeWonder, visit http://typewonder.com