The world's top YouTube star, Swedish gaming streamer PewDiePie, has moved to Japan after the country relaxed its COVID-19 entry rules for some visa-holders.

The 32-year-old has a huge online following, with 111 million subscribers on YouTube, but has faced controversy over offensive jokes in the past.

He posted a video this week documenting his arrival with his wife and dogs in Japan, which has some of the strictest virus border controls in the world.

"For so long we doubted whether we could even make this move, and we went through all the ups and downs, and obviously it's been a really long journey," said the streamer, whose real name is Felix Kjellberg.

"But I just really, really appreciate everyone who was supportive of us going ... it just feels amazing to be here, finally."

Japan has allowed in foreign business visitors, students and other new residents since March but remains closed to tourists, although the prime minister has pledged a gradual easing of the rules from next month.

Details of who will be allowed to enter and when are yet to be announced, although Japanese media reports say group tours may be first to resume and that the government is discussing scrapping COVID-19 testing on arrival.

Japan welcomed a record 31.9 million foreign visitors in 2019 and had been on track to achieve its goal of 40 million in 2020 before the pandemic hit.

Kjellberg, who previously lived in Britain, had announced in 2019 that he had bought a house in Japan.

Born and raised in Sweden's Gothenburg Kjellberg registered his YouTube channel "PewDiePie" in 2010, primarily posting "Let's Play" videos of horror and action video games. His channel saw substantial growth in popularity in subsequent years in 2012 and 2013 as he became the most-subscribed on YouTube on Aug. 15, 2013.

Over time, his style of content diversified to include vlogs, comedy shorts, formatted shows, and music videos. From 2015 to 2018, his content also shifted away from Let's Play content and became increasingly subject to media controversies particularly in 2016, including over videos containing what were perceived as anti-Semitic remarks and racial slurs.

Kjellberg also previously said he was "sickened" after hearing that the gunman behind the 2019 New Zealand mosque massacre had promoted his videos before opening fire.

In 2019, following a public competition with Indian record label T-Series, Kjellberg was overtaken as the most-subscribed YouTube channel. His channel currently holds the title of the fourth-most subscribed, albeit remaining the most-subscribed YouTube channel owned by an individual.

As of March 2022, his channel has over 111 million subscribers and has received 28.2 billion total views.

His popularity online boosts sales for the titles he plays, and has allowed him to stir support for charity fundraising drives.