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2018: Re: BLACKPINK, Square Up, BLACKPINK In Your AreaIn January 2018, it was announced that the group would released a repackage of their debut Japanese mini album titled Re: BLACKPINK on March 28.

On June 15, 2018, the group released their first Korean mini album titled Square Up with "Ddu-Du Ddu-Du" as the title track.

The group embarked on their first tour, BLACKPINK Arena Tour 2018, in Osaka, Japan on July 24–25. On September 12, it was announced that the group would hold their first concert in Seoul titled BLACKPINK 2018 Tour (In Your Area) Seoul x BC Card at Olympic Gymnastics Arena. Later in the month, English singer Dua Lipa collaborated where can i get blackpink merch with BLACKPINK with the song "Kiss and Make Up", as part of the complete edition of her self-titled debut album, which released on October 19, 2018.