 This study investigated the effectiveness of various digital filters in reducing noise in electrocardiography, ECG, signals. The study used six different types of digital filters, including Butterworth, ChibuChef I, ChibuChef II, and Elliptic filters. The study found that the Butterworth filter produced the best results, with the highest suppression of noise at frequencies around 0.5 Hz and 100 Hz. This article was authored by Iduaget Hariwesana, Prayambadakayanobrah, and Rizki Ali-Arrakman.