How to Secure PDF Files with PDF Encryption

Esther Joan
Aug 29, 2022

PDF files are widely used nowadays and certainly users aspire to further learn about this file format so as to make full of its functions. Now, we would like to secure PDF documents that we can we can protect our private information from being viewed by other people. Or maybe we have some valuable training course, price list, bid file, etc. that saved in PDF format and no matter how, we don’t want to lose them. Then, which is the best and easiest solution to encrypt PDF files?

Here, we introduce two methods to secure PDF files. You can check their detailed description and choose the suitable one for you.

Method 1: Encrypt PDF Files using Adobe Acrobat

Method 2: Encrypt PDF documents with Coolmuster PDF Encrypter

Method 1. Encrypt PDF Files Using Adobe Acrobat

Step 1. Open the PDF files you want to encrypt with Adobe Acrobat. You can also use Acrobat to create a new PDF file.

Step 2. Navigate to the Tools button, click it and choose the options like: Protection – Encrypt - Encrypt with Password.

Step 3. A dialog box named Applying New Security Settings will appear, just click Yes to continue.

Step 4. Enter a password in the Document Open Password field and click OK to apply the encrypting settings. Make sure you have checked the "Encrypt all document contents" and "Require a password to open the document" options.

Weakness: Maybe you have noticed that Adobe Acrobat only allows you to add open password to your PDF, which only protect your PDF from being opened by other people. However, that is far short of our expectations. If you need to add owner password, encryption level and even detailed permission options, you can move to the second solution below.

Method 2. Encrypt PDF with Coolmuster PDF Encrypter

Coolmuster PDF Encrypter is an affordable and easy to use tool to encrypt PDF files. it allows you to easily set user password (open password) to prevent other people to open your PDF. For demanding users, you can even set owner password and choose whether you want others to print, copy or modify your PDF documents. Below are the simple steps for how to secure PDF on Coolmuster PDF Encrypter, which works well on Windows 8, Windows 7, Windows XP, etc.

Step 1. Download PDF Encryption Software

The program comes with free trial version that allows you to encrypt 3 PDF files for free. Mac version is available too. Click the download button to download and install them on your computer.

Step 2. Upload PDF Files

Launch the software and loading the target PDF files from your local disk by clicking the button of Add Files. For full version of the program, you can add as many as PDF files you want to perform an excellent and time-saving batch PDF encryption.

Step 3. Customize Encryption Settings

There are three security sections allowing you to protect your PDF files furthest according to your wishes.

- Set user password to open PDF files; Set owner password and change permission settings.
- Set encryption level: Support 3 different encryption systems: 40 bit RC4, 128 bit RC4 and 128 bit AES.
- Set permissions: set permissions for either PDF processing actions like printing, copying, modifying, annotation adding, form filling, etc.

Step 4. Start PDF Encryption

After above encryption settings, you can choose an output folder where you want to save the encrypted PDFs by clicking the Browse button. Finally, hit on the "Encrypt" button to begin the encryption process for all the imported PDFs. If you want to encrypt specific PDF, you can right-click on it and choose "Encrypt Selected".

Which Method is Better?

If you have already installed Adobe Acrobat on your computer and have no too high requirement on PDF encryption, method one is suitable for you. But if you don't have Adobe Acrobat, we suggest you try the Coolmuster PDF Encrypter, no matter you are a computer novice or expert. After all, it is much cheaper than Adobe Acrobat.

Free download PDF Encrypter to have a try:

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