Preheat the oven to 350°F (175°C).
Mix the crushed pretzels, melted butter, and sugar until well combined.
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.
In a large bowl, beat the cream cheese, sugar, and vanilla until smooth.
Fold in the whipped topping until fully combined.
Spread the cream cheese mixture evenly over the cooled crust, making sure to seal all the edges to prevent the gelatin from soaking into the crust.
In a separate bowl, dissolve the strawberry gelatin in the boiling water. Let it cool until slightly thickened but not set.
Arrange the sliced strawberries over the cream cheese layer.
Carefully pour the cooled gelatin over the strawberries.
Refrigerate for at least 4 hours, or until fully set.
Slice into squares and serve chilled.