Usesumatrapdf-tool.exeor SumatraPDF.exe with the same arguments.
Available in pre-release 3.7
In the application #
To encrypt a PDF in SumatraPDF:
- open an unencrypted PDF document
- press
Ctrl + Kto open the command palette - select
Encrypt PDF
Or:
- open an unencrypted PDF document
- right-click to open the context menu
- select
Document>Encrypt PDF
From the command line #
To encrypt a PDF with a password using SumatraPDF from the command line:
sumatrapdf-tool clean -E aes-256 -U pwd foo.pdf foo-encrypted.pdfFlags:
-E: encryption algorithm-U <pwd>: password required to open PDF file
You can see all flags.
You can also decrypt a PDF.