We can only speculate and hypothesize since we can’t actually jump into Jupiter. However, as proven during the Apollo missions, the less mass a celestial body has, the weaker the gravity. Meaning that jumping into the moon would take a while for you to land. And jumping into Jupiter would take a short amount of time because of the high mass. However you would only last a few seconds, as the atmospheric pressure would crush you a millisecond after you gain speed.
