![]() On Windows: navigate to the PDF file -> right click on it -> select Open with -> click Choose another app -> Choose Adobe Acrobat Reader DC or Adobe Acrobat DC -> check Always use this app to open.The steps to set default programs on Windows and Mac are different. Besides, you’d better set Acrobat Reader DC or Acrobat DC as the default PDF file reader. Please install the free Adobe Acrobat Reader DC or Acrobat DC on your computer if you didn’t have one before. Windows Photo Viewer Can’t Open This Picture Error! Here, I’ll list the common reasons for PDF files not opening issue. Some of them can’t help but ask: why can’t I open a PDF. The PDF files won’t open after users clicked on it. ![]() There are a lot of people saying they can’t open PDF in Windows 10, Windows 8, or Windows 7. What are the causes of PDF files not opening? How to fix when you can’t open PDF files? Please keep reading. But the problem is some users can’t open PDF. The modern web browsers like Google Chrome, Mozilla Firefox, and Internet Explorer can easily open PDFs besides, Acrobat Reader DC and Acrobat DC are two useful tools to help users open PDF files on their computer. PDF files are mainly used to present documents including images and text information. PDF is the acronym of Portable Document Format, which is a file format developed by Adobe in the 1990s. How to fix PDF file won’t open in Internet Explorer?.Why does this happen? How to fix when you can’t open PDF files on your computer or in a browser like IE? Please find answers in the following content provided by MiniTool Solution. But many people say they have trouble opening a specific PDF file. Please refer to Adobe Acrobat’s website for more details.In fact, most web browsers you use currently allow you to open PDF files easily. At the prompt to confirm the password, retype the appropriate password in the box and click OK. To apply 256-bit AES encryption to documents created in Acrobat 8 and 9, select Acrobat X And Later.Ĭlick OK. 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.For example, Acrobat 7 cannot open a PDF encrypted for Acrobat X and later. It is important to choose a version compatible with the recipient's version of Acrobat or Reader. The Compatibility option you choose determines the type of encryption used. Choose a version equal to or lower than the recipients’ version of Acrobat or Reader. Select an Acrobat version from the Compatibility drop-down menu. For each keystroke, the password strength meter evaluates your password and indicates the password strength. Select Require a Password to Open the Document, then type the password in the corresponding field. If you receive a prompt, click Yes to change the security. Open the PDF and choose Tools > Protect > Encrypt > Encrypt with Password. Please refer to Microsoft Office support website for more details. Each time you open the document, you will be prompted to enter your password to access its contents. Microsoft Word will now indicate the document is protected. Click Encrypt with Password.Įnter the password again to confirm it and click OK. ![]() Click the File menu, select the Info tab, and then select the Protect Document button. The procedure is standard for most Office applications, so for this example, we will use Microsoft Word 2016.įirst, open the Office document you would like to protect.
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