Selected in the sixth round in 2022, Karlsson split time between the junior level and SHL in 2023, but in the last three seasons, he has played in the third-tier HockeyEttan pro league. For Vimmerby HC and had 13 points (5 goals, 8 assists) in 31 games in 2023-24, last season, with Falu IF, the 22-year-old started out slow, but finished with 14 points (7 goals, 7 assists) in 32 games. This season with Lindlovens IF, he has 10 points (5 goals, 5 assists) in 18 games.
