How to select all pages of a PDF with vertical text

[Michel_TJL]

I have a document that contains a few hundred pages. All pages are currently in portrait orientation, but some pages contain text that was originally in landscape orientation, so it is difficult to read. I would like to be able to select all the pages whose original orientation was landscape in order to put them back in the right orientation. Is it possible to do this without having to manually select each page?

Thanks

[JR Boulay]

Answer in image:

[Michel_TJL]

Thanks for this tip, but I don't want to rotate all portrait pages, only the ones that the writing is on a landscape mode. Some pages of my file is written on portrait pages and some are written on landscape pages. but when the PDFs were merge, all the pages were rotate to be on portrait. I've try to do OCR on the document, but most pages didn't rotate correctly.