How to know if a PDF contains only images or has been OCR scanned for searching?

Question

I have a bunch of PDF files that came from scanned documents. The files contain a mix of images and text. Some were scanned as images with no OCR, so each PDF page is one

Answer 1

Apago's pdfspy extracts information from PDF into an XML file. It includes information about the document including images and text. For your project, the useful information includes image count & size and where there is OCR (hidden) text.

http://www.apagoinc.com/pdfspy