Let's say 100 PDFs each 5 pages long so about 500 pages.
This is my current method. It's quite tedious:
- Turn PDF into image with online free converter
- In MS paint, flip them all horizontally
- Convert the pictures back to PDF
So basically the letters and numbers on every page are backwards.
What's a better way?
Flipping horizontally is not a rotation unless my understanding geometry is wrong. So unfortunately, I can't just highlight the pictures in the file explorer and do rotate horizontally.
I use Windows 10.