This article explains how to clear iPhone clipboard by replacing the saved item with blank text.
The clipboard in iOS is quite limited. It can only hold one piece of information at a time and is not directly accessible to a user. But you can use that limitation to your advantage.
Replacing the text in the clipboard with blank text is a good way to effectively erase the old information stored there. All you have to do is copy a space and you’re done. Here’s how to do it.
Open an app with a text input field. We recommend Notes.