How do you password protect a PDF?

You can password protect a PDF by either using Adobe Acrobat or an online PDF tool that lets you add a password to your file.
Here’s how to use our free online tool to password protect your PDF:
  1. Open the Password protect PDF tool
  2. Click the "Choose File" button
  3. Select the PDF you want to convert on your computer, and click "Open"
  4. After loading your file, enter a password of your choice
  5. Your new, password-protected PDF file will download directly to your browser
If you decide to use Adobe Acrobat instead, here are some quick instructions on how to password protect your PDF:
  1. Open the PDF file with Adobe Acrobat
  2. Click on "Tools" > "Protect" > "Encrypt" > "Encrypt with Password"
  3. Tick "Require a Password to Open the Document
  4. Type the password you want
In addition, you can select your preferred Acrobat version compatibility which comes with specific encryptions:
  • "Acrobat 6.0 and Later" encrypts the PDF document using 128-bit RC4
  • "Acrobat 7.0 And Later" encrypts the PDF document using the AES encryption algorithm with a 128-bit key size
  • "Acrobat X And Later" encrypts the PDF document using 256-bit AES

Password protecting a PDF is easier with online tools

Online PDF tools today make it easier than ever to password protect a PDF and even unlock PDF files. The process is faster, and you don’t need to worry about specific encryptions as the best protection is guaranteed.