The company also includes various modifications or humorous features, such as 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." The font Catull was used, "I was trying to find something that was both traditionally tied to the beautiful fonts in the past and also had a very current and in some ways surprising ways", says Ruth, "I really loved the way that it had these very elegant stems and ascenders and descenders and also had these Serifs that were very, very precise and I wanted something that when you looked at it, it was very clear that it's something you haven't seen before".
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 utilizes 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 slightly updated, with 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.
On September 1, 2015, Google introduced a controversial "new logo and identity family" designed to work across multiple devices. The notable difference in the logo is the change in the typeface. The colors remained the same, however, Google switched to a modern, geometric sans-serif typeface called Product Sans, created in-house at Google (and also used for the Alphabet logo).
Initial Google logo from September 15, 1997 to September 27, 1997
Original logo in Baskerville Bold, used from September 28, 1997 to October 29, 1997, with a different color combination from the one in use today. Back then, the initial "G" was green.
The logo used from October 30, 1997 to May 30, 1999, differs from the previous version with an exclamation mark added to the end, an increased shadow, letters more rounded, and different letter hues. Note that the color of the initial G changed from green to blue. This color sequence is still used today, although with different hues and font.
The company logo changed to one based on the Catull typeface and was used from May 31, 1999 to May 5, 2010. The exclamation mark was removed, and it remained the basis for the logo until August 31, 2015.
The logo used from May 6, 2010 to September 18, 2013, showing a reduced distance of the projected shadow, a change in the second "o" to a different yellow hue and a more flattened lettering.
The logo used from September 19, 2013 to August 31, 2015, showing flattened lettering and the removal of shadows.
The logo used since September 1, 2015, featuring a new typeface called Product Sans. The colors remain unchanged from the previous logo.
A colorless version of the logo is particularly used on a local homepage in recognition of a major tragedy, often for several days. The design was first used on the Google Poland homepage following the Smolensk air disaster that killed, among others, Polish presidentLech Kaczyński in April 2010. A few days later, the logo was used in China and Hong Kong to pay respects to the victims of the Qinghai earthquake.
On September 7, 2010, the doodle once again changed to a greyed-out Google logo that lit up with the standard Google colors as the first 6 letters of a search query were entered. It goes by the name of the Keystroke Logo.
Google's favicon from May 31, 1999, to May 29, 2008, was a blue, uppercase "G" on white background. It was accompanied by a border with a red, blue, and a green side.
On May 30, 2008, a new favicon was launched. It showed a lowercase "g" from Google, colored in blue against a white background, and originally was intended to be a part of a larger set of icons developed for better scalability on mobile devices.
A new favicon was launched on January 9, 2009. It included a left-aligned white "g" with background areas colored in red, green, blue and yellow, with the top, bottom, and left edges of the "g" cropped. It was based on a design by André Resende, a computer science undergraduate student at the University of Campinas in Brazil. He submitted it for a contest launched by Google in June 2008 to receive favicon submissions. The official Google blog stated: "His placement of a white 'g' on a color-blocked background was highly recognizable and attractive, while seeming to capture the essence of Google".
The favicon used from August 13, 2012, to August 31, 2015, showed the small letter "g" in white, centered on a solid light blue background.
As of September 1, 2015[update], Google's favicon shows a capital letter "G", in the tailor-made font for the new logo, with segments colored red, yellow, green, and blue.