"To Be Human" is a pop ballad; some critics believed it reflects the film's core relationship between Gal Gadot's Wonder Woman and Chris Pine's Steve Trevor. Lyrically, the song expresses a love that can conquer all odds. It is the only non-instrumental song on the soundtrack album.
In Rolling Stone, Brittany Spanos thought that with the "cinematic" single, Sia "creates a sweeping, epic musical moment". Lauren Tom for Billboard wrote that "Sia's powerful song reflects the film’s underlying message", noting the singer "channels her inner Wonder Woman". Megan Davies in Digital Spy opined the song is a "powerful new anthem". RandallColburn of Consequence of Sound wrote: "The swelling, anthemictrack, is a rousing one, bound to underscore a tender moment between Gal Gadot and co-star Chris Pine".