How to remove a text box without losing the typed text?

Select the text in the text box and copy it, then paste it elsewhere, for example into the body of the document.

You can then safely delete the text box.

If you have a reference in the Visual Basic Editor to the "Microsoft Forms 2.0 Object Library", a macro containing the following code can be used

Dim atextbox As Shape

Dim mydata As dataobject

For Each atextbox In ActiveDocument.Shapes

If atextbox.Type = msoTextBox Then 

    Set mydata = New dataobject 

    mydata.settext atextbox.TextFrame.TextRange.FormattedText 

    mydata.putinclipboard 

    atextbox.Select 

    atextbox.Delete 

    Selection.Paste 

End If 

Next atextbox

There is a really simple solution that was available in Word 2003 that is no longer offered: The Format Text Box dialog offers the option to Convert to Frame...

Once the text box is converted, you can right-click and choose Format Frame... In the Frame dialog, you can then choose Remove Frame, which converts the contents into normal text.

It's unfortunate that this simple solution is no longer available.

Thanks however the text box is on a poster with an uploaded photo. I will see if what has been shared will do the job.