She started her career as a playback singer with the song "Ek Je Achhe Raja" in the Bengali film Khela (2008).
She has recorded songs for many films including 'I am 24, Raanjhanaa', 'Revolver Rani', 'Dangerous Ishq', 'Panchlait', 'I am Banni', 'Kaanchi', 'Prem Ratan Dhan payo', 'Expose', 'Gurudakshina', 'Do lafzon ki kahani', 'Ye Kaisa Tigdam', 'Bansuri', 'I Love Desi', 'Love you Soniyo', 'Dhoop chaav, Malhar' and others.
Apart from Hindi and Bengali, she has also made her debut with other Indian languages, including Tamil, Telugu, Kannada, Malayalam, Gujarati, Marathi, Nepali, Rajasthani, Bhojpuri and also in Bangladeshi films.
She has received honours like Filmfare Award (East),[2] Anwesha performed in Sabujer Deshe in 2000 (ETV Bangla).
Anweshaa sang the title tracks of these serials:- In 2007–08, she participated in the juniors version of the popular musical reality show Amul STAR Voice of India named Chhote Ustaad.