Google is refining its famous logo as it prepares to become a part of a new holding company called Alphabet.
Yahoo has refreshed its logo for the first time since shortly after the Internet company's founding 18 years ago.
Yahoo's push to re-invent itself will include a new logo to be introduced next month.
Google dedicated a doodle Tuesday to the Swedish-American inventor of the modern zipper, Gideon Sundback, on what would have been his 132nd birthday.
Google Doodle, which highlights anniversaries on the Google search engine, Monday showcased Francois Truffaut, the late French "new wave" film-maker who would have turned 80 on Monday.
Google paid tribute to Charlie Chaplin on Friday by transforming the celebrated logo on its homepage into a silent movie.
Google paid tribute to Russia's Yuri Gagarin on Tuesday, replacing the logo on its homepage with an image of the first man in space and a rocket that a visitor can launch with a cursor.
Google paid tribute to Jules Verne, author of "Twenty Thousand Leagues Under the Sea," on Tuesday, replacing the logo on its home page with an underwater scene.
Google paid tribute to former Beatle John Lennon on Friday by replacing its celebrated logo with a video featuring his classic song "Imagine."