The Apple Support Community will permanently close on November 20, 2026. Starting today, the site will no longer accept new posts and is available in a read-only state.
You can continue to find trusted guidance and support on the official Apple Support site.
We want to thank the community members who have contributed their time and expertise to help others with their Apple products.
The Apple Support Community will permanently close on November 20, 2026. Starting today, the site will no longer accept new posts and is available in a read-only state.
You can continue to find trusted guidance and support on the official Apple Support site.
We want to thank the community members who have contributed their time and expertise to help others with their Apple products.
Does anyone know what type of encryption does macOS Catalina uses for encrypting PDF files using the Preview app? Thanks a lot.
128-bit AES. Want more, then choose a PDF Editor that can provide 256-bit, though at the expense of compatibility with PDF readers that may not support that level of encryption.
What PDF encryption does Preview use on macOS Catalina?
