Using online tools

1. Choose a tool: Select a free online service such as Adobe Acrobat online. 

2. Upload the file: Click "Select a file" or drag and drop your PDF into the designated area. 

3. Enter and confirm the password: A prompt will appear asking you to enter a password. Type your desired password and then retype it to confirm. 

4. Set the password: Click the "Set password" or "Protect" button to begin the encryption process. 

5. Download the file: Download the new, password-protected version of your PDF. 

 

Using built-in applications

• On a Mac (Preview):

  1. Open the PDF in Preview. 

  2. Go to File > Export. 

  3. Click the "Permissions" button in the pop-up window. 

  4. Select "Encrypt with password," enter a password, and click "Apply". 
      

• On Windows (Microsoft Word):

  1. Open the PDF in Microsoft Word. 

  2. Go to File > Export or Save As. 

  3. Click Options in the "Save As" dialog box. 

  4. Check the box for "Encrypt the document with a password" and click OK. 

  5. Enter and confirm the password, then click OK to save.