Over the past few decades, research into more ecologically friendly packaging materials has significantly increased to reduce non-renewable plastic usage. In this context, biobased films were synthesized from extracted lemongrass leaves. An integrated pretreatment of conventional alkali followed by deep eutectic solvents (DES) was utilized to fractionate the lemongrass leaves into three usable forms, i.e., hemicellulose (HC), lignin (L), and cellulose, which were further utilized in the synthesis of composite films. A total of 4 films have been synthesized, labelled as: Film 1 (CMC HC), Film 2 (L HC), Film 3 (CMC L), and Film 4 (CMC HC L). Film 4 has shown a good water absorption capacity of nearly 65 % and also a higher contact angle of 99.90°, while film 2 has the highest thermal stability among all the films. Film 3 has better UV properties due to the presence of carboxymethyl cellulose (CMC) and lignin. Statement of noveltyIn the present work, composite films have been synthesized from lemongrass leaves for the first time. This is the first report that synthesizes the films from extracted components (CMC, lignin, and hemicellulose) of lemongrass leaves. In this study, all the components were extracted via sequential conventional alkali and DES pretreatment. After extraction, these components were utilized for the composite film synthesis, which is used for various applications of their desirable properties.