The planet in our solar system with the strongest surface gravity is Jupiter.
Jupiter’s surface gravity is about 24.79 m/s², roughly 2.53 times Earth’s average surface gravity of 9.81 m/s². This results mainly from Jupiter’s enormous mass: it contains more than twice the mass of all the other planets combined. Although Jupiter is made mostly of hydrogen and helium, its deep interior is compressed to extreme densities, producing a powerful gravitational field.
Strictly speaking, Jupiter has no solid surface like Earth. The quoted value refers to a conventional level in its atmosphere where the pressure is about one bar, comparable to sea-level pressure on Earth. Gravity decreases farther from Jupiter’s center, so the value varies with altitude and latitude because the planet rotates rapidly and bulges at its equator.
Neptune and Saturn are also massive, but their surface or cloud-top gravity is weaker. Saturn is especially easy to misidentify because it is larger in diameter than Jupiter, yet its much lower average density gives it weaker surface gravity. Jupiter’s gravity also helps control its many moons and contributes to its extensive system of rings and magnetic fields.