For other related logos and images see: Pixar/Other
Pixar's first logo (which was based off the design of their image computers) was a light grey square frame with an embedded circle in the center (nicknamed "the BSD" (Beveled Square with a Dent), which was a play on the Berkeley Software Distribution version of Unix that Pixar used) and a wordmark placed below that read "P·I·X·A·R" created by John Lasseter with a stone cutter using a typeface based off of Stevens Titling. For the first short film the logo had a fanfare to accompany it. The square started to fade away in later years of the logo's existence, leaving just the wordmark. This logo made it's debut in Luxo Jr. and on their image computers.
Pixar Animation Studios
During the production of Toy Story, Pixar left the square logo for a spaced out wordmark set in Charlemagne Bold. This identity was created by fellow Pixar employee, Pete Docter. The 'I' would usually be replaced by a Pixar character that most resembles an 'I' (Mascot "Luxo Jr." is used on-screen who jumps on and squashes the 'I' in the company's name). This logo first appeared at the end of Toy Story and debuted on the beginning of future Pixar films, starting with A Bug's Life.