Google’s legal incorporation date is September 4, but the company has traditionally celebrated its birthday on September 27. The reason for choosing that particular date is tied to important milestones in the company’s early history, including announcements connected with the size of Google’s search index.
The celebration date has changed during the company’s history. Google has used different dates for its birthday doodles, which has sometimes caused confusion among users. For the 25th anniversary in 2023, Google’s birthday observance again focused on September 27.
The distinction matters because “Google founded date” can refer to several moments: the launch of the BackRub research project, the registration of the Google.com domain, the company’s incorporation or the birthday date used in public celebrations. The clearest official milestone is September 4, 1998, when Google Inc. was incorporated.
