If the entire page highlights, it is likely a scanned image. If a cursor appears, the PDF document contains text. An alternate way to test for text within the PDF is to try to select all the text.

For those who have fumbled with a clunky scanner or panicked over misplaced documents, the iScanner App is here to improve ...

Google Docs features tools that let you write, edit, and format text ... You might need to attach scanned documents while ...