2023年11月8日 — From the Protect a PDF toolset in the left pane, select Encrypt with password. Select File > Protect Using Password. In the Advanced Options ...
PDFEncrypt is a free, open-source native Windows app that allows you to password protect (encrypt) PDF files for free, without purchasing expensive software ...
5. Open the PDF and choose Tools > Protection > Encrypt > Encrypt with Password. 6. If you receive a prompt, click Yes to change the security ...
2023年12月18日 — Another website that will password protect a PDF is CleverPDF, which offers a wide variety of tools. At the website, click the Encrypt PDF icon.
Protect your PDF files online by adding a password that will prevent people from being able to copy or print your PDF document. Secure PDF files for free.