Terms of the contract have not been disclosed, but a source told ESPN NFL Insider Ed Werder that Boldin agreed to a two-year deal worth $12 million, including $9 million in guaranteed money.
The 33-year-old wide receiver also posted a statement titled \"The Return To The Bay\" on his foundation's website.
\"49er fans, I wanted to be the first to tell you that I'm returning to San Francisco,\" Boldin said in the statement. \"Looking forward to joining my teammates, coaching staff and fans to bring back another championship to the Bay Area. Let's go after our Quest For Six.\"
The 49ers acquired Boldin from the Baltimore Ravens last March for a sixth-round pick.
Boldin had a huge season for the Niners a year after helping the Ravens beat San Francisco in the Super Bowl. The three-time Pro Bowler had 85 catches for 1,178 yards and seven touchdowns.
He also helped fuel the 49ers' offense for the first 11 games while Michael Crabtree was out with a torn Achilles. He was a leader of the team and respected by coaches and players.
Niners general manager Trent Baalke and coach Jim Harbaugh have both said that keeping Boldin was important to the team's plans.
ESPN NFL Insider Ed Werder and ESPN.com 49ers reporter Bill Williamson contributed to this report.
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