The Gunners paid tribute to the 29-year-old shot-stopper on the club's official website, crediting the Poland international for the glorious cup run of 2014: "Fabianski was an instrumental part of the Gunners’ FA Cup-winning side last season.
"He conceded just three goals in five matches en route to the final, and made two crucial penalty saves in the semi-final shoot-out against Wigan, before helping the team to victory in the final in his last appearance for the club."
Fabianski - who was acquired on a free transfer and signed a four-year contract - said on Swansea City's site that the decision was an "easy one to make."
He said: "I’m very excited for the coming season and the coming years. It will be a big honour to represent Swansea City. Everyone interested in football knows that Swansea is a proper football club. The way they play football is nice to watch and they have always been an exciting team.
“Based on what the club has achieved in the three previous seasons in the Premier League, you can clearly see that year upon year the club is moving forward. The club represents good values and the style of football is something that I would like to be a part of.
“I know quite a bit about them already, but I am sure I will get to know quite a bit more in the coming months. For me, it was an easy decision to make to join the club."
Fabianski leaves on a good note with the fans he leaves behind, however, there are some who hope that his exit does not spark an exodus as Arsenal "sell more than [they] buy".
Fabianski is a great player.. marshall would be a great replacement #afc— Afez Kuzairi (@afezkuzairi) May 29, 2014
Just seen the news about Fabianski to Swansea. They've got an excellent keeper in him. Shame he wasn't able to stay on at #AFC though.— Man Like DRB️ (@B_Foxy83) May 29, 2014