Hleb's departure from the Emirates Stadium seemed likely all summer after the player admitted he was "mentally tired" of the combination of living in London and playing top-level football.
He joined Arsenal in 2005 after the club paid Bundesliga outfit Stuttgart £11.2m for his services.
Hleb becomes Barcelona's fifth summer signing following the arrivals of Seydou Keita, Gerard Pique, Martin Caceres and Daniel Alves.
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