In addition to her acting career, Steinfeld also has done modeling work.
She was hired as the face of Miu Miu shortly after True Grit was released in 2011.
She portrayed Juliet Capulet in the 2013 film adaptation of William Shakespeare's romantic tragedy Romeo & Juliet, Zooey Renner in the 2014 crime film 3 Days to Kill, and Violet in Begin Again.
In 2015, she played Emily Junk in the musical comedy Pitch Perfect 2.
Her debut single "Love Myself" was released along with a music video in August 2015; the single has been certified platinum in several countries. The film was released internationally on December 22, 2010, and her performance was well received by critics.
Richard Corliss of Time Magazine called it one of the Top 10 Movie Performances of 2010 and wrote that Steinfeld "delivers the orotund dialogue as if it were the easiest vernacular, stares down bad guys, wins hearts. The role was originally intended for a 20-year-old actress; since there was some concern that she would be asked to appear nude in the film, its director explained that when Steinfeld was cast, the script was changed to make it "age-appropriate for a 14-year-old." In March, Steinfeld was included on the list of actors who lent their voices to the English-language dub of the Japanese animated film When Marnie Was There.
She is known for her portrayal of Mattie Ross in the 2010 film True Grit, for which she was nominated for the Academy Award for Best Supporting Actress, the Screen Actors Guild Award for Outstanding Performance by a Female Actor in a Supporting Role, and the BAFTA Award for Best Actress in a Leading Role.She also played Petra Arkanian in the 2013 sci-fi film Ender's Game.Steinfeld plays Anna alongside Kiernan Shipka as Marnie.In May, Republic Records announced the record deal and that Steinfeld was working on her first release; a label executive said she "has the vision, natural talent and dedication to compete at the highest level." The following month, Steinfeld released "Love Myself", including the lyrics, "I'm gonna put my body first/And love me so hard 'til it hurts" and "I'm gonna touch the pain away/I know how to scream my own name"; the music video, released one week later, features Steinfeld wearing a leotard emblazoned with "self service".
Steinfeld said the lyrics are intended to be interpreted by the listener, "but for me it's an empowerment record and it's ultimately about taking care of yourself and indulging yourself, whether that be emotionally or physically or with material things." Steinfeld's debut EP is titled Haiz, the nickname used by her fans, because "it would feel like, one, they named it; and two, it was my gift to them." Haiz was produced by Mattman & Robin and features co-writers Julia Michaels and Justin Tranter. It will be interesting to see how people respond." The EP was released on November 13, 2015, to mixed reviews.
Popdust gave Haiz a 3.5 grade out of 5, saying the EP's only downfall is that four "mostly sturdy and often vigorous [songs] are not enough to get a true sense of who Steinfeld is and what she’s trying to say." Vulture called Haiz "fascinating, but for all the wrong reasons": the first two singles, "Love Myself" and "Hell Nos and Headphones", are "delivered with such dead-eyed, finger-on-the-zeitgeist blandness" that they disprove their intended points; "Rock Bottom" is "propulsive but forgettable"; and "You're Such A" could be made by someone else "into something punchier." Steinfeld portrays Nadine, the leading role in The Edge of Seventeen, a coming-of-age comedy film co-starring Blake Jenner, Woody Harrelson and Kyra Sedgwick, and written by Kelly Fremon.