"The Premier League will be a step up for me, but I've played in the European competitions and also for my country so I've experienced different levels of the game.
The Portuguese striker has penned a three-year deal at the Wales club for an undisclosed fee, believed to be in the region of £5million, and is determined to make the step up to Premier League level.
"I am very happy to have signed with Swansea. It's a big club and I believe I can progress as a footballer here," said Eder on the club's official website.
"Hopefully my team-mates will help me develop and settle in quickly at the club. I can't wait to meet all of them when I report for pre-season training.
"Swansea are a solid club who have big ambitions – last season confirmed that – and it's great for me to be a part of it."