pdftk_notes

### rotate pages by 180 degrees

pdftk in.pdf cat 1-endsouth output out.pdf

Ref:- https://people.uleth.ca/~daniel.odonnell/blog/rotating-one-or-more-pages-in-a-pdf-in-linux - where I found the above solution.

### store a pdf without password

qpdf --password=YOURPASSWORD --decrypt input.pdf output.pdf

If the password has some special characters, quote it.

qpdf --password="YOURPASSWORD" --decrypt input.pdf output.pdf
pdftk secured.pdf input_pw YOURPASSWORD output unsecured.pdf

Note:- If possible switch to using qpdf instead of pdftk. There were couple of instances where the pdftk command failed and qpdf succeeded.

Ref:- https://www.cyberciti.biz/faq/removing-password-from-pdf-on-linux/ - Mentions qpdf; gives more alternatives.

### encrypt a pdf with password

pdftk in.pdf output out.pdf user_pw foo

Note:- I was unable to encrypt a pdf file using Adobe Reader X1 Version 11.0.13 . I could not find the “Tools pane” described in http://www.adobe.com/content/dam/Adobe/en/products/acrobat/pdfs/adobe-acrobat-xi-protect-pdf-file-with-permissions-tutorial-ue.pdf. I also tried File → Properties → Security after opening the file. However all the options in that window are greyed out. So I can't add a password from there as well. I was told that Adobe Standard can do this but it costs money whereas pdftk is free. In the end, using pdftk was a no brainer.

### make two copies of the same document

pdftk in.pdf cat 1-end 1-end output out.pdf

See also: https://superuser.com/questions/600877/how-do-i-duplicate-pages-within-pdf-files-automatically - has a script to duplicate it by page (as in 1,1,2,2,…)

• pdftk-java