Yes, you are free to cancel your subscription any time, penalty-free. After cancellation, your plan will remain active until the end of the current billing period, at which time your account will be automatically switched back to the Free plan.
What happens to my documents if I cancel or let my subscription lapse?
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Your documents are safe! You will always be able to log in to your account and view your documents, regardless of whether you have an active subscription. When a subscription ends, any documents over the Free plan quota will be placed in a read-only mode, but you can still access them and export them freely without resubscribing.