Yes, you can cancel your CKEditor 5 trial at any time before it automatically converts to a paid plan. To do so, log in to your account via the Customer Portal, go to the Billing section, and open Subscription Management. From there, you can modify your selected plan or cancel the trial entirely.
If you selected a free plan, your license will automatically continue without Premium Features after the trial, even if you don’t cancel. However, if you added your card details, usage-based charges may apply if you exceed the limits of the free tier.