Kimchi is a traditional Korean fermented vegetable containing several ingredients. The purpose of this thesis was to compare homemade nonfermented fresh kimchi as well as kimchi fermented for seven and three days with store-bought kimchi by determining antioxidant activity (AOU) and the total phenolic content in kimchi juice and extracts. In our research, we used beachu kimchi by brand Chongga as well as kimchi made at home from locally bought ingredients. We measured the pH value of our samples with the use of pH paper. Total phenolic content of extracts was determined spectrophotometrically according to Folin‒Ciocalteu method, the results of the analysis were expressed as an equivalent of the chlorogenic acid. AOU was evaluated using DPPH• radical scavenging method. AOU was expressed as trolox equivalent. The highest AOU was determined in homemade kimchi that was left to ferment for three days (0,22 mg/g in juice and 0,38 mg/g in extract) as well as in the store-bought kimchi (0,24 mg/g in juice and 0,44 mg/g in extract). The pH values of these samples were close to the optimum pH value reported elsewhere (pH 4,2). The average total phenolic compounds in homemade kimchi juice was 0,27 mg/g and in in extracts 0,33 mg/g. The total phenolic compounds in store-bought kimchi juice was 0,53 mg/g and in extract 0,42 mg/g. From our research it can be concluded that fermentation duration and the pH value of kimchi affects the total phenolic content and antioxidant activity.