Free PDF Tools: Encrypt and Decrypt

Encrypt or Decrypt PDF documents (Master Password or User Password may be required).  Protect PDF files with passwords and prevent PDF files from being printed, copied, changed, filled, extracted, signed, assembled or merged. Supports Adobe® Standard 40-bit Encryption and Adobe® Advanced 128-bit Encryption. 

1. Choose  Free PDF Tools > Encrypt and Decrypt.

2. Select a PDF file that you want to add password or change security options.

3. The Password and Security Options dialog box comes up:

User Password is used to open the PDF document

Owner Password is used to change security settings

Encryption Level

• 40-bit RC4: Acrobat 3.0 and Later
• 128-bit RC4: Acrobat 5.0 and Later

Security Options:

• Printing:  Allow to print
• Modify Contents:  Allow to modify
• Copy:  Allow to copy or extract
• Modify Annotations: Allow to add or modify annotations or form fields
• Fill In:  Allow to input form field and signature (128-bit RC4 only)
• Screen Readers:  Allow to enable accessibility (128-bit RC4 only)
• Assembly:  Allow to modify document assembly (128-bit RC4 only)
• Degraded Printing:  Allow to print degraded mode (128-bit RC4 only)

4. Click Save As to have a new PDF file.  The new file may be launched automatically if you have installed Adobe Reader.

5. Do experiment with the options available to see which best suit your needs.  Click Close to finish.

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