'Louder' gained positive reviews from contemporary music critics. According to Amanda Hensel of PopCrush, Charice actually comes to terms with the soiled love affair pretty quickly, and vows to keep marching on because it’s the right thing to do. She also addressed ‘Louder’ to be destined for greatness as the feel-good anthem of the summer. Bill Lamb of About.com reviewed Charice's song, claiming "All of the past history aside, the new song "Louder" is a great pop record. It puts 19 year old Charice in a youthful, uptempo context that would slide perfectly into current pop radio playlists. You will find yourself singing along with the chorus, "I'll let my heart speak louder than my head," before you are finished with hearing the song the first time."
After her 9/11 performances in Florida, Charice shot the music video for "Louder" on September 13, 2011. The music video was directed by Tim Cruz. Gil Duldulao, who choreographed the One Day music video, again lend his talent to the "Louder" music video. The music video premiered on EW.com on 18 October 2011. In November 18, 2011, the music video received the Best Music Video Award in the 2011 International Film Festival Manhattan (IFFM).
On the video, Charice was shown singing by the window before it was swapped with an empty room where she continues singing. The room then goes back again to the first scene before shifting towards another room where she is seen being accompanied by two unknown dancers. As she sings the chorus, the scene changes to different location while on the line "feel that rhythm" the video vibrates as if imitating shock waves.