As a designer you have probably acquired hundreds of fonts over time. Sometimes you need to visualize those fonts to be able to see how they will fit into a particular design.
There is a website that allows you to do this called http://Wordmark.it
This site loads up all of your fonts and displays them with sample text of your choice and gives you the ability to change the font size as well as display them inverse if you choose.
Bookmark this one you will find it useful!!