How to Password Protect a PDF — Secure PDF for Free

How to Password Protect a PDF on Windows

Many PDF applications have a good performance on Windows systems. They help solve all common PDF issues without any limits. In this part, we will introduce you to two top-rated PDF software warmly welcomed by Windows users. One is SwifDoo PDF, and the other is Adobe Reader.

How to Password Protect a PDF with SwifDoo PDF

SwifDoo PDF is one of the most full-featured PDF software capable of solving all PDF-related problems. It works well on all Windows systems, from XP to 11. Actually, if you’re a fan of Windows and looking for a handy PDF tool, we strongly recommend SwifDoo PDF.

How to Password Protect a PDF in Adobe Reader Free

Adobe Reader is a free version of Acrobat to view, create, fill, and print PDF files. In fact, it’s not only available on Windows, but also on macOS. Adobe Reader is not as powerful as Acrobat Pro, but it helps a lot if you only need to add a password to a PDF.

How to Password Protect a PDF on Mac

Since Mac users have a default PDF viewer (Preview) that can meet all basic editing needs on PDF files, they don’t have to download any third-party software. Preview’s primary purpose is to offer users an easy way to check photos and PDF files, and later it began to enable users to make simple editing on PDF files.

How to Password Protect a PDF Online

The three methods we’ve mentioned above are all offline solutions, how about using online tools? By using an online PDF editor, you don’t have to waste time finding or downloading other applications. Consequently, you won’t worry about any computer viruses or downloading unwanted software.

Let’s Wrap It Up

In this post, we offered you a step-by-step guide on how to password protect a PDF. With both online and offline, Windows and Mac operating systems covered, there’s no doubt that most of you can find a solution to add passwords to those important PDF documents.

  • Two types of passwords supported
  • 100% safe & secure to prevent all edits
  • The easiest way to password protect a PDF for free



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I’m fascinated by the influence of evolving technologies, computer software/hardware as well as social behavioral norms.