Delete All Completed Reminders At Once
The Reminder app for iPhones has the option to show completed reminders, but there is no convenient solution to delete all at once. icloud.com will save your day in this case because it will help you to delete all completed reminders at once!
This trick does not work on iOS because you cannot visit the website iCloud.com on your iPhone or iPad. So you need a computer (Mac or PC) with internet access for this short guide.
Delete all completed reminders at once
Open the website iCloud.com in any browser on your computer.
Enter your Apple ID and password und click the sign in arrow.
On the home screen of your iCloud account, you have to choose Reminders.
In the sidebar on the left side, click Reminders or another list, of which you want to delete the completed reminders.
Below the name of the list, you will see the number of completed tasks. Click the arrow next to it.
It will open a drop-down menu, in which you will see all the completed tasks (sorted by completion date).
On the right side, you will now encounter a new button: Clear Completed. By pressing this button you can irreversibly delete all completed reminders in this list. This process has to be confirmed again on a pop-up window and then it’s all cleared out.