Baltimore obtained Boldin from the Arizona Cardinals on Friday for a third- and fourth-round pick in the 2010 draft. Baltimore also got a fifth-round pick from Arizona.
The 29-year-old Boldin has amassed at least 1,000 yards receiving in five of his seven seasons, including 1,024 yards on 84 catches last season.
Boldin received a new four-year, $28 million deal with Baltimore in which $10 million is guaranteed. He was to set to earn $3 million next season, the last of the four-year, $22.5 million deal he signed with Arizona after the 2005 season.
"The Ravens just got better," coach John Harbaugh said. "Anquan is a significant addition for us. He fits the personality of our team with the hard-nosed, physical way he plays. We love the way he competes. Our fans will enjoy watching him compete and his teammates will be excited to have him with us."
Baltimore's top priority this offseason was to bolster a wide receiving corps that last season featured Derrick Mason, Mark Clayton, Kelley Washington and Demetrius Williams. Mason was the lone receiver with 1,000 yards, and running back Ray Rice led the team with 78 receptions.
Mason and Washington are unrestricted free agents, but with the addition of Boldin and free agent Donte' Stallworth, who was signed last month, Baltimore appears to have improved its wideout situation regardless of whether Mason and Washington return.
The 6-foot-1, 217-pound Boldin was the Cardinals' No. 2 receiver behind Larry Fitzgerald. Boldin is a physical player capable of making a crushing block or a difficult catch, but his one shortcoming has been injuries. He has had one injury-free season since 2003 and last season missed both of Arizona's playoff games with ankle and knee injuries.
But the Ravens couldn't be happier to have him.
"Anquan is a player who makes the tough catches and he is outstanding getting yards after catches," Ravens general manager Ozzie Newsome said. "He will also help the running game with his blocking skills. He's a very tough competitor and, with the way he plays with passion, he will fit right in with the foundation we have for our team."
Boldin was delighted with the news.
"I'm definitely excited. For me, I've been hoping for this for a year since I first heard that the Ravens might be interested in me," he said. "The Ravens play a certain way. They play as hard and as physical as any team in the league, and I want to add to that. I think I play the way they play."
The trade of Boldin has grown ever more likely since the opening of Arizona's training camp in 2008, when he accused the Cardinals' management of lying to him by promising a new contract during that offseason.