To correspond with the methods applied in Part 2 “How to Protect a PDF file”, I put following methods here to unlock a PDF file: Method#1 Unprotect Password-protected PDF on Mac with Preview It happens when you know the PDF password, but want to remove its password protection for totally free controls on these files.

I summarize following 2 situations to finish this part of “How to Unprotect a PDF file”: Situation A and B. Password protected PDF prohibits wandering eyes or undesired changes to the meat of your protected PDF files from others, but have you ever feel tired of entering the password for each work with these files? Have you ever forgotten the PDF passwords of your own protected files? I guess yes, and then go forward to see how to unprotect a PDF file. How to Unprotect Password-protected PDF on Mac? To apply 256-bit AES encryption to documents created in Acrobat 8 and 9, select Acrobat X And Later.

Acrobat X And Later (PDF 1.7)-encrypts the document using 256-bit AES.

Acrobat 7.0 And Later (PDF 1.6)- encrypts the document using the AES encryption algorithm with a 128-bit key size.

Acrobat 6.0 And Later (PDF 1.5)- encrypts the document using 128-bit RC4.

When you are done editing, just click the “Encrypt”. Just select he PDF that you want to encrypt first, Click the lock icon on the top toolbar to navigate to the encrypt panel, after that you’ll see the interface below, here you can choose to add both “user password” and “owner password”, and detailed information to this PDF file, including title, author, keywords, creator, and subject. Launch PDFManagerUltimate on your Mac, Drag and drop the PDF file that you need to encrypt to the app. Even, it can perform OCR on the scanned PDFs to make it searchable and editable again. Enter the password and click 'OK”Ĭisdem PDF Manager Ultimate is the tool that can encrypt PDF files with user password and owner password, In addition to securing your PDF document, it also offers the ability to read, edit, manage and convert PDF files to a wide range of formats PDF, Word, ,HTML, ,Excel, etc. Step 2. Check the password type you want to set and tweak the permission setting if necessary. Open the PDF with Adobe, go to 'Security' and choose 'Encrypt with Password” Click 'Save' to save a encrypted PDF Method#2 Password Protect PDF on Mac with Adobe Step 2. Check 'Encrypt' and enter the password

Open the PDF with Preview, go to 'File” and choose 'Save as” Here I pick up 2 commonest ways to protect a PDF file FOR FREE: Method#1 Password Protect PDF on Mac with Preview There are too many methods available to protect a PDF, Adobe, Mac Preview, Web-based tools, Third-party App like PDF MANAGERULTIMATE …… Now that we have a general understanding about PDF password according to Everything about PDF Password, we can protect our PDFs as we need. How to Unprotect a Password-protected PDF on Mac?.

How to password protect pdf free mac