Freeman, 24, is coming off a season in which he hit a career-best .319, tied a personal high with 23 home runs provided 109 RBI, also tops in his four-year career.
The deal, worth a reported $135 million, is the richest in the Braves' history.
Freeman has racked up 68 homers, 93 doubles and 280 RBI with a .285 average in 471 career games with Atlanta, which took him in the second round of 2007 amateur draft.
Easer Egg Roll brings thousands to White House
Yosemite climber falls 30 feet, suffers major injuries