Will I lose my padlets if I cancel my Pro subscription?
When you downgrade, you can continue using the Basic Plan for free. All the Padlets you have created as a Pro user are saved in your account. If your padlets exceed the basic tier, creating and editing padlets may be limited until you remove padlets or subscribe to Padlet Pro again.
A good alternative to deleting padlets is to archive ones you no longer use to free up space in the basic tier.