Preheat the oven to 350°F.
Stir the crushed pretzels, melted butter, and 3 tablespoons granulated sugar together until evenly coated.
Press the pretzel mixture into a 9x13-inch baking dish.
Bake the crust for 10 minutes.
Let the crust cool completely.
Beat the softened cream cheese and 3/4 cup granulated sugar until smooth.
Fold in the whipped topping gently until fully combined.
Spread the filling over the cooled crust and seal it all the way to the edges.
Dissolve the strawberry gelatin in the boiling water and stir until fully clear.
Let the gelatin cool until it is no longer hot.
Stir in the sliced fresh strawberries.
Pour the strawberry topping gently over the cream layer.
Refrigerate until fully set, at least 4 hours.