At least 100,000 people have converged in Belgrade for a massive rally in the Serbian capital seen as a culmination of months-long protests against populist President Aleksandar Vucic.

The Serbian president conceded the need for "change" after the largest demonstrations in decades hit Belgrade.

Serbian anti-corruption protesters, riot police, and supporters of President Aleksandar Vucic faced off in central Belgrade on Saturday as tens of thousands of people turned out for massive anti-government rallies following a night of sporadic clashes.