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macOS Catalina 10.15
macOS Mojave 10.14
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Password-protect a PDF in Preview on Mac

You can give a PDF a password that everyone must enter to open the file. The password is used to encrypt the file.

Open Preview for me

  1. In the Preview app on your Mac, open the PDF you want to password-protect.

  2. Choose File > Export, then select Encrypt.

  3. Type a password, then retype it to verify the password.

See alsoManage versions of a Preview document in Preview on MacLock PDFs and images in Preview on Mac
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