What are the types of PDF encryption methods?

How to encrypt PDF files? In fact, there are many ways to encrypt, convert pdf to word online for free adobe acrobatand the key is to see how much you need to encrypt.

For example, I just want to encrypt part of the data, or delete part of the text, or encrypt the whole PDF file, so that no one can open it.

From the above three angles, I share three encryption methods of PDF documents, which should be the most complete encryption sharing of PDF documents ~

Number One, the basic version of encryption

"Ciphertext" Function Course of PDF Document

Sometimes you need to share PDF courseware and PDF reports, but you want to make them public, merge png to pdf ilovepdfand you don't want the core information to leak out. What am I supposed to do?

At this point, we must use the PDF software“Encryption” function, merge two pdf pages into one page macits principle is to hide and encrypt sensitive information to avoid data leakage.

PDF document encryption function

The following takes PDF as an example to demonstrate the ciphertext operation method:

Step 1: Install PDF, drag the file directly into a software to open.

Step 2: Mark the encrypted text area, as shown in the figure below. Click Mark as encrypted text under the Protection option.

Step 3: Save the encrypted file, click“Apply encrypted text”, you can distribute the encrypted file to others.

Click view PDF document encryption.

In the above step, the method of marking the range is as simple as selecting the text area that you want to mark as ciphertext.

After completion, the marked regional economy will be covered in black, and others can no longer view it. The specific teaching effect is shown in the following figure.

Of course, if you don't like black, you can choose area, right-click, select properties, set mosaic cover color.

Click to view the encryption effect of PDF.

PDF [ encrypted text ] is the property of the encryption technology, others can not see the hidden content, can not be modified, completely ensure the security of the file.

Second, the advanced version encryption method

PDF document used to erase a function design tutorial

If you are uncomfortable with encrypted documents, or want to make PDF documents more beautiful, as fans said in private letters.

If you want to ensure the beauty of PDF, it is recommended that you use the PDF erase function to directly erase important data and prevent information leakage.

Click to view PDF erasure technology features.

The PDF document erasure feature is also easy to work with. Take PDF for example, long-click the mouse, select the area to erase, click“Erase”, erase information.

Click to view the effect of PDF erasure technology.

As you can see from the image above, the erased PDF document is so clean that no one will notice it when they read it.

By the way, the box selection function here can not only erase the information, but also copy the selected text into the picture u002Ftext information.

High level encryption method

PDF file bulk encryption course

If your PDF document may be very large, and the data of many management pages need to be overwritten, it is too time-consuming for us to mosaic or erase them one by one. It is recommended to use the batch mosaic function.

PDF batch Mosaic function

Under the protect option, click search and mark ciphertext, and then type in the search box the word you want to mark as ciphertext, such as experience.

PDF batch Mosaic function

Click the search button, and the PDF will automatically retrieve all the words about "experience".

Before marking a word as encrypted text, check the check box on the left, and then click apply all encrypted text tags to block all similar words.

PDF batch Mosaic function

Is it simple and quick to follow the above steps?