Filler episodes start from episode 26 Here are some episodes confirmed to be filler:
Black Clover is one of the easiest modern shonen anime to binge-watch because it respects the source material so heavily. With only 14 true filler episodes out of 170, the risk of wasting time is minimal.
Is it essential? No. But if you love the Black Bulls as a family, these 7 episodes feel like a bonus OVA. Consider them “optional dessert.”