The Google logo appears in numerous settings to identify the search engine company. Google has relied on several logos since its renaming (see History of Google), with the first logo created by Sergey Brin using GIMP. A revised logo debuted on September 1, 2015. The previous logo, with slight modifications between 1999 and 2013, was designed by Ruth Kedar; the wordmark was based on the Catull typeface, an old style serif typeface designed by for the Berthold Type Foundry in 1982.
The company also includes various modifications or humorous features, such as cartoon modifications of their logo for use on holidays, birthdays of famous people, and major events, such as the Olympics. These special logos, some designed by Dennis Hwang, have become known as Google Doodles.
In 1998, Larry Page created a computerized version of the Google letters using the free graphics program GIMP. The typeface was changed and an exclamation mark was added mimicking the Yahoo! logo.
"There were a lot of different color iterations", says Ruth Kedar, the graphic designer who developed the now-famous logo. "We ended up with the primary colors, but instead of having the pattern go in order, we put a secondary color on the L, which brought back the idea that Google doesn't follow the rules."
In 2010, the Google logo received its first major overhaul since May 31, 1999. The new logo was first previewed on November 8, 2009, and was officially launched on May 6, 2010. It utilises an identical typeface to the previous logo, but the "o" is distinctly more orange-colored in place of the previously more yellowish "o", as well as a much more subtle shadow rendered in a different shading style. On September 19, 2013, Google introduced a new "flat" (two-dimensional) logo with a slightly altered color palette. On May 24, 2014, the Google logo was updated, the second 'g' moved right one pixel and the 'l' moved down and right one pixel. The old 2010 Google logo remained in use on some pages, such as the Google Doodles page, for a period of time.