How to add 'open password' to PDF files?

php editor Baicao teaches you how to add an "open password" to PDF files to protect file security. By using Adobe Acrobat software, you can easily set a password for a PDF file so that the file can only be opened by entering the correct password. This function is very practical and protects the privacy of files and prevents unauthorized persons from viewing the file contents. Let's learn how to add an "open password" to PDF files to ensure that the file information is safe and reliable.

Tool 1: PDF Editor

Normally, PDF readers do not support password protection. If you need to set a password, it is recommended to use a special PDF editor to achieve it. Just choose a suitable PDF editor and install it.

After installation, open the PDF file through the editor, then find the [Protection] tab in the menu list, and click [Password Encryption] in the tab list;

After the [Password Encryption] dialog box pops up, enter the password you want to set twice in the blank field, and then click [OK]. The "Open Password" of the PDF file will be set.

If you no longer need password protection, click the [Protection] tab in the menu list, and then find [Delete Security Settings];

After a dialog box pops up prompting "Are you sure you want to delete the security settings in the document?", click [OK], and the "Open Password" of the PDF will be deleted.

Tool 2: Multifunctional PDF Tool

Using the multi-functional PDF tool, you can also set an "open password" for PDF. Take Pepsi Niu PDF Password Recovery Tool as an example. The "Add Open Password" in the tool has this function.

Tool link: Pepsi Niu PDF Password Recovery Tool

After selecting the [Add Open Password] module, import the PDF file that requires adding a password into the tool interface, and then click [Start];

After going to the next interface, enter the password you want to set in the password field, click [OK], and the "open password" of the PDF file will be set.

If password protection is no longer needed, you can also use tools to delete it.

In the initial interface of the tool, the [Remove Password] module is used to delete the "open password" of PDF files.

After selecting the [Remove Password] module, import the PDF file whose password needs to be deleted, then enter the originally set password in the password field, and click [Confirm] to delete it.

The PDF file with the "open password" deleted will be saved as a new file, and the original file will still exist. Click [Open Folder] on the tool page to find the PDF file with the password removed.

It should be reminded that the above two methods of removing "open password" are removed when the password is remembered but no longer needed to be protected.

If you forget your password, you cannot use the above method. Because the first method requires opening the PDF file with a password before deleting it; the second method also requires entering the original password before deleting it.

If you forget your password, you cannot open the PDF file using the PDF editor, nor can you delete the password. In this case, it is recommended to choose the second tool: Pepsi Niu PDF Password Recovery Tool, although it cannot be deleted directly in the tool. "Open Password", but the [Retrieve Password] module can help us retrieve the "Open Password" of PDF.

Tool link: Pepsi Niu PDF Password Recovery Tool

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