How to set and remove PDF file protection?

php Xiaobian Yuzai teaches you how to set up and remove PDF file protection. PDF file protection is a common security measure that prevents files from unauthorized access or modification. Setting password protection for PDF files can ensure file security, and removing password protection can facilitate the use and sharing of files. This article will introduce how to set up and unprotect PDF files on different platforms, allowing you to better manage and utilize PDF files.

Generally speaking, to set and remove these two passwords, you usually need to use a PDF editor. Next we'll discuss how to do these operations with and without an editor.

Using PDF editor:

If you have a PDF editor, we can find the [Protect] option on the editor, and then click [Password Protection] in the list under [Secure Document].

.

After a new page pops up, if you want to set an opening password, check [Require a password to open this document], then enter the password you want to set twice, and click [OK]. Open the password and set it.

.

When you open the PDF again, you will be prompted to enter a password to open the file.

.

If you need to set a restricted password, in the page that also pops up above, check [All document permissions] and enter the password you want to set twice.

.

You can also click the [Permissions] option to select the scope of restrictions, such as whether to allow modification, copying, printing, etc.

After selecting, click [OK] and open the PDF file again. The file will be restricted and cannot be edited.

.

If you no longer need PDF file protection later, both of the above password settings can be lifted. The method is also very simple: also click the [File] option above the editor, and then click [Move] in the list under [Secure Document] Remove security settings].

.

If you want to cancel the opening password, the following dialog box will pop up. Click [OK], and the opening password of the PDF file will be released.

.

If you want to cancel the restricted password, the dialog box below will pop up. Enter the originally set password in the blank field, click [OK], and the restricted password of the PDF file will be lifted.

.

It should be noted that to unlock the password for a PDF file, you need to enter the original password. If you forget it, you can refer to another method introduced below.

Without PDF editor:

If you don’t have a PDF editor, how can you set and unprotect PDF files? You can try to use other tools to solve these two problems at the same time, such as Pepsi Niu’s PDF tool:

In the toolbar, select the [Add Password] module to set an opening password; select [Remove Password] to remove the opening password; select [Remove Restrictions] to remove restrictions even without a password.

Tool link: Pepsi Niu PDF Password Recovery Tool

The above is the detailed content of How to set and remove PDF file protection?. For more information, please follow other related articles on the PHP Chinese website!