Brats artwork and packaging was designed by
New York City-based studio Special Offer, Inc. The cover is a
lime green square with the title in lowercase imposed in
Arial font. In a cover story interview for
Vogue Singapore, Charli told Chandreyee Ray that criticism led her to question why fans feel "ownership over female artists" so much so that they demand their photograph be on all their work; she had previously called it "misogynistic and boring" on
Twitter. Of the album cover's colour—which is Pantone 3507C—she said that she had noticed that the colour green was heavily oversaturated in the media and fashion, and added: "I wanted to go with an offensive, off-trend shade of green to trigger the idea of something being wrong. I'd like for us to question our expectations of pop culture—why are some things considered good and acceptable, and some things deemed bad? I'm interested in the narratives behind that and I want to provoke people. I'm not doing things to be nice". Kristin Robinson of
Billboard claimed that Charli had been "inspired by a 1990s neon rave flyer and the title credits to
Gregg Araki's 2007 comedy,
Smiley Face". Despite its simple appearance, the album cover's design underwent a five-month development process, maintaining a green square with text. Designer Brent David Freaney selected the colour after examining around 500 shades, aiming for an off-putting, garish effect. The final shade resonated with Charli's vision of bold irreverence. The typography, based on Arial, was chosen for its non-"precious" feel. While considering various Swiss typefaces, Freaney wanted to surpass
Helvetica. The text, slightly stretched to "give it a personality", is awkwardly placed to be neither small and tasteful nor large and loud, creating an opinion-less aesthetic. In the weeks leading up to
Brats release, a wall in
Greenpoint, Brooklyn—which fans called the "brat wall"—was painted and repainted with the album's signature green color and various messages. Over the summer, its messages changed frequently in line with the album's promotion cycle. The first message was "i'm your fav reference"—a lyric from the single "360"—before it was repainted to read simply "brat". On 10 June, when
Brats deluxe edition was released, the wall was changed to white with the message "brat and it's the same but there's three more songs so it's not". By the middle of June, the wall remained white but changed its message to "lorde", indicating Lorde's possible involvement with future releases pertaining to
Brat, which soon appeared in the remix version of "
Girl, So Confusing". The final message of the
Brat wall—"ok bye!" in the album's signature green—was painted on 1 July. During her performance at
Coachella 2025 in April 2025, Charli XCX projected a new version of the cover on screen with scribbles on the letters, which would be shown on streaming services and later modified with brown, metallic rust the next month. It has been linked to a possible announcement of the end to the
Brat era. On the album's first anniversary on 7 June 2025, the cover was once again changed similar to the original cover, only with the text reading "forever <3". On 30 June, the cover was changed back to the original version. == Critical reception ==