His attorney, Christopher Lyons, said Stallworth was released from the Turner Guilford Knight Correctional Center early Friday.
The 28-year-old Stallworth served 24 days of the 30-day jail sentence after pleading guilty to DUI manslaughter.
Stallworth's car struck and killed a pedestrian, 59-year-old Mario Reyes, in an early-morning crash March 14. In a recorded interview, Stallworth told police he drank up to four shots of premium tequila while partying with friends at a Miami Beach club, but did not feel drunk in the hours before he struck Reyes.
Lab tests later showed Stallworth had a blood-alcohol level of .126, above Florida's .08 limit.
Stallworth also reached an undisclosed financial settlement with Reyes' family, which factored into his relatively light sentence.
The receiver has been suspended indefinitely by the NFL. He signed a seven-year, $35 million contract with the Browns before last season but was injured much of the year, finishing with 17 catches for 170 yards and a touchdown.
Information from The Associated Press was used in this report.