Preheat the oven to 350°F (175°C).
Combine the crushed pretzels, melted butter, and sugar until evenly coated.
Press the mixture firmly into the bottom of a 9×13-inch baking dish.
Bake for 10 minutes, then allow the crust to cool completely.
Beat the softened cream cheese, sugar, and vanilla until smooth and creamy.
Fold in the whipped topping until light and fluffy.
Spread the cream cheese mixture evenly over the cooled crust, making sure to seal it completely to the edges of the pan.
Dissolve the raspberry gelatin in the boiling water. Let it cool until slightly thickened but still pourable.
Arrange the fresh raspberries evenly over the cream cheese layer.
Slowly pour the cooled gelatin over the raspberries.
Refrigerate for at least 4 hours, or until fully set.
Slice into squares and serve chilled.