In fact, there are many ways to encrypt PDF files, the key is to determine how much to encrypt

Suppose I wanted to encrypt only part of the data, or delete part of the text, or encrypt the entire PDF file, so that no one could open it.

From three perspectives, the above author shares three encryption methods for PDF documents, which seems like the most comprehensive encryption for PDF documents.

Encryption technology in its basic form

Design tutorials for PDF documents with "ciphertext" features

It is sometimes necessary to share PDF courseware and PDF reports, but you do not want the core information leaked.

What should I do?

To prevent data leakage, it is necessary to use PDF software's "cipher" function to hide sensitive information.

Encrypting PDF documents

An example of PDF encrypted text can be found below.

The first step is to install PDF and then drag the file directly into the software.

Click "Mark as a cryptotext" under the "Protect" option to mark the data encryption processing text for the region.

After clicking "Apply Encrypted Text", you can distribute the encrypted document.

The encrypted PDF document can be viewed by clicking here.

It is easy to mark the range by selecting the text area to be marked as cipher text in the above steps.

After the marking of the regional economy is covered by black, others can no longer view. The specific teaching effect is shown below.

Of course, if you do not like a black, but also by selecting the region, right-click, select a different property,combine pdfs for free windows and set the mosaic overlay color.

pdf to word converter offline software free download full version

View the PDF encryption effect by clicking here.

PDF document [encrypted text] is characterized by the use of encryption technology, others cannot see the hidden content, but also cannot modify it, guaranteeing its security.

The second method is the advanced version of encryption

Create a tutorial for erasing PDF files

You can encrypt PDF documents if you are not accustomed to it, or make PDF documents more beautiful.

It is recommended that you use PDF erase function to directly erase the important basic data to prevent leakage of enterprise information systems if you do not want to compromise the PDF's beauty.

View the technical characteristics of Erase in PDF format

A PDF document can also be erased by long pressing the mouse, selecting the area to be erased, and clicking "Erase".

View the PDF eraser effect by clicking here

Also, you can copy the selected text to the picture using the box here, in addition to erasing data information.

Methods of advanced encryption

Tutorial on batch encrypting PDF documents

There may be a lot of management pages in your PDF document, so going one at a time to splice or erase is a waste of time. Instead, use the batch mosaic capability.

Mosaic function for PDF batches

Select "Protect", click "Search and Mark Encrypted Text", and then type the word you wish to mark as encrypted text into the search box.

The PDF will automatically retrieve all the words about "experience" when you click the "Search" button.

You can block all enterprises that use similar words by checking the checkbox on the left, then clicking "Apply research to all information encrypted text for labeling".