Abstract: A stabilizing mechanism for rigid fixed and extension ladders that includes an anchorage assembly removably mounted to one of the rungs of a ladder. A linkage assembly is mounted to the anchorage assembly through a transversally and rotably mounted elongated base that permits the setting of linkage assembly in one of several angular positions. Two arched arm members are pivotally mounted to a plate and also, with two linkage arms that are pivotally mounted to a swivel bracket, this two linkage assembly permits the arch members to move coplanarly between two extreme positions. The arm members releasably embrace a support structure thereby providing a firm engagement of the ladder to the support structure. A stabilizing pad assembly includes two pads mounted to adjustable elongate members to engage surrounding surfaces for more stability. A release mechanism remotely disengages the ladder from the support structure after a user descends from the ladder.