Abstract: An improved ladder leveler which is made up of a tapered inner square bar and outer square tube which slide axially in relation to each other to vary the degree of extension. Locking the same in position by turning a threaded bolt until said bolt touches the tapered surface of said inner square bar. (See drawings) The ladder required to make our invention universally adjustable to compensate for differences in uneven terrain, whether sloping downward from left to right, or right to left will be built with one leg shorter than the other. The unit will be attached to said shortened leg. Said leveling and locking system differs from prior art in that there are no incrementally spaced holes to receive a locking pin. We find those systems to be inconvenient as the holes are in the adjustable legs which are inside an outer sleeve and therefore invisible to the user who is required to search for the hole that most nearly locks the leg at its required length.