Encrypt PDF from Google Docs on Mac
On Mac, you have two practical paths for encrypting a PDF from Google Docs: the built-in Preview app for AES-128, or PDF24 in the browser for AES-256. Neither requires a paid application.
Using Preview for quick encryption
After the Docs to PDF extension downloads your PDF, double-click it to open in Preview. Go to File > Export as PDF. Click the Permissions button at the bottom of the dialog. Enable 'Require password to open document,' enter a password, and click Save. Preview writes a new encrypted file alongside the original.
Using PDF24 for AES-256 on Mac
If you need AES-256 on Mac without Adobe Acrobat, go to pdf24.org, select Protect PDF, upload your file, and enable the AES-256 option in the advanced settings. Download the result. This involves sending the file to PDF24's servers, so reserve it for documents that are not highly sensitive.
Using Adobe Acrobat on Mac
If you have Adobe Acrobat installed on your Mac, it is the strongest option. Open the PDF, go to Tools > Protect > Encrypt with Password, select Acrobat X or later for AES-256, and save. Acrobat also lets you set permissions restrictions on top of the open password.
Frequently Asked Questions
Does Mac Preview always use AES-128?
Yes, Preview uses AES-128 for password-protected PDFs. For AES-256 on Mac, you need Adobe Acrobat or a web-based tool like PDF24 with advanced settings.
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