Splitting pages of PDFs?

I have scannend PDFs with two real A4 pages on one A3 PDF page, like this:

Can DEVONthink cut pages like this into two?

Or is there annother tool out there doing this easily?

Many thanks for any pointers!

DEVONthink doesn’t support this but you could use Preview.app and Tools > Rectangular Selection. Select & copy the first page, then use File > New from Clipboard and save the page as a PDF, afterwards process the second page the same way.

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I use PDF Scissor, a cheap one-trick app that does exactly and only this.