More than 35,000 fans created a sea of orange and black at AT&T Park.
Hunter Pence was among the players who fielded questions from fans.
Others signed balls and posters and took pictures with those who waited a long time in line.
"Yeah, I got my dad's glove autographed," said Giants fan Erin Santiago. "I think it took, like, about an hour." When asked if it was worth it, she answered, "It was very worth it. I got to see Buster Posey and Tim Flannery."
This is the 21st straight year the Giants have hosted FanFest.
The first spring training game is later this month against the Oakland Athletics.