How are PDFs encrypted?

In fact, there are many ways to encrypt PDF files, merge multiple photos into one pdf the key is to determine how much encryption is needed.

If I want to encrypt only part of the data, delete part of the text, or encrypt the entire PDF file, I can do it.

In the three angles above, I shared three PDF file encryption methods, which should be a complete list of PDF file encryption methods.

Let's start with the basic version of encryption.

Tutorial for the "Ciphertext" function in a PDF document

When you need to share PDF courseware and PDF reports, but you don't want the core information to leak, what should you do?

Our next step is to use the PDF software's "Encryption" function, which hides and encrypts sensitive information.

Encryption function for PDF documents

Here is an example of the ciphertext operation method using PDF:

Install the PDF and drag and drop it into the software to open it.

Click Mark as encrypted text under the Protection option to mark the encrypted text area.

You can share the encrypted file with others by clicking "Apply encrypted text".

View PDF document encryption by clicking here.

Marking a range as ciphertext is as simple as selecting a text area.

Upon completion, the marked regional economy will be covered in black, and others will not be able to view it.

In case you don't like black, you can choose area, right-click, select properties, and set mosaic cover color.

View PDF's encryption effect by clicking here.

PDF files [ encrypted text ] are protected by encryption technology, so others cannot see the hidden content, and they cannot be modified.

The second method of encryption is the advanced version

A PDF document used to erase a tutorial on function design

If you have issues with encrypted documents, or if you would like to make PDF documents more beautiful, as fans have expressed in private correspondence.

To prevent information leakage, it is recommended to use the PDF eraser function to directly erase important data to ensure the PDF looks good.

View the features of PDF erasure technology by clicking here.

Take PDF for example. Long-click the mouse, select the area to erase, click "Erase", and the information is erased.

The effect of PDF erasure technology can be viewed by clicking here.

You can see in the image above that the erased PDF document is so clean that no one will notice it.

The box selection function here can not only erase the information, but also copy the selected text into the picture/text.

Method for high-level encryption

Course on bulk encryption of PDF files

Using the batch mosaic function is recommended if your PDF document is very large, and there are many management pages that need to be overwritten.

Mosaic function for PDF batches

In the protect option, click search and mark ciphertext, and then enter the word you want to mark as ciphertext in the search box.

Mosaic function for PDF batch files

The PDF will automatically retrieve all the words related to "experience" when you click the search button.

In order to block all similar words, check the check box on the left before marking a word as encrypted text.

Mosaic function for PDF batches

How easy and quick is it to follow the above steps?