To password protect a PDF document for secure sharing, you can encrypt the file with an open password using built-in operating system tools, official Adobe services, or alternative office applications to prevent unauthorized access.
The exact implementation depends on your operating system and preferred software ecosystem.
💻 Using Native Built-In OS Tools (No Software Installation) On a Mac (via Preview) Open your PDF file in the native Preview application.
Click on File in the top menu bar, then select Export as PDF (or Export…). Click the Permissions button at the bottom of the window. Check the box for Require Password To Open Document. Type your password, verify it, and hit Save. On Windows (via Microsoft Word)
Right-click your PDF, choose Open With, and select Microsoft Word. Click File → Info → Protect Document.
Select Encrypt with Password from the dropdown menu, then type and confirm your password.
Click Save As, change the “Save as type” dropdown back to PDF, and click Save. 🌐 Using Free Web Browsers Tools
If you do not want to install any software, you can encrypt files directly through secure web tools. Via Adobe Acrobat Online
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