The comparative studies were performed in order to assess the most suitable matrix polymer for potassium sorbate (KS). The preservative (1.0, 2.0, 3.0, 4.0 % w/w) was included into edible films made from different biopolymers: carboxymethyl cellulose (CMC), oxidized potato starch (OPS), soy protein isolate (SPI), gelatin (GEL), sorbitol, candelilla wax, and emulsifier. The incorporation of KS dramatically reduced the toughness of all tested films. The plasticizing action of KS was the weakest in CMC-based films, which exhibited the highest initial stiffness and the lowest stretchability. With the exception of GEL films, KS addition caused an increase in water vapor permeability of the films. Moreover, except for CMC films, increased KS content in the films led to increase in the stickiness, moisture content, and solubility. CMC-based films, regardless of the concentration of KS, had unchanged hygroscopicity and were completely water-soluble. In most cases, KS reduced transmission of light through the films. OPS, SPI, and GEL films, in contrast to CMC-based ones, exhibited sorbitol crystallization; however, the addition of KS successfully overcame this disadvantage.The antimicrobial effectiveness of all tested films increased by increasing the KS concentration. The kind of carrier used affected antimicrobial effectiveness of KS, and SPI films tended to have the weakest antibacterial and antifungal activity, especially at low KS content. The data given here may provide a useful guide in establishing the best compromise between conflicting film property demands. Taken together, our findings suggest that the CMC films could be the best carrier for KS.