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If you can’t select or copy text in a PDF in Preview on Mac
When you’re viewing a PDF in Preview and you can’t select or copy text, try one of the following.
In the Preview app
on your Mac, go to the PDF page you want to change.Check the following:
The Text Selection tool may not be selected. Click the Show Markup Toolbar button
, then click the Text Selection button 
.The PDF may require a password before you can select or copy text. Choose Tools > Show Inspector, click the Encryption button
, then enter the password.The text might be an image instead of actual text. You can’t select the text in this case.