- Yair Mark
Today I wanted to rotate the scan of a pdf that scanned upside down. Tools like Adobe PDF Reader can do this - but you need the paid version. Luckily I have WSL setup with Ubuntu on Windows.
After a bit of Googling, I found that an opensource command-line tool pdftk can do PDF rotations.
This used to be easy to install on older versions of Ubuntu using
apt but it has been removed from the software repositories. Luckily it can still be installed from source fairly easily.
Install from Source
Follow the comprehensive steps from this answer specifically the "Install from source" section
Alias the Jar
Once you have built the jar, create a folder in your home directory called jars (the name can be anything):
mkdir -p ~/jars
Then update your relevant
rc file to include the following alias:
alias pdftk='java -jar ~/jars/pdftk.jar'
rc file and now you should be able to run
pdftk from the command-line.
Rotate the pdf
To rotate the pdf we need to understand how the
pdftk cli works.
This answer has a really good explanation of this:
pdftk input.pdf cat 1-endsouth output output.pdf
# \_______/ \___/\___/ \________/
# input file range | output file
The different directions are based on the above answer and this one: