Stored on this device
This is everything you have entered that this site keeps on this device. None of it is sent anywhere. There is no account.
Your browser also keeps copies of pages you have opened, so they work without a connection. Erase everything removes those copies too.
What is stored
Keep a copy
A copy of everything listed above is saved as a file on this device. Nothing is uploaded.
Erase everything
This removes everything listed above from this device.