Password Protect PDF to Keep Your Data Safe

Set User Password (Open Password) to prevent PDF from unauthorized access/opening.

Encrypt PDF with Owner Password to protect PDF from unauthorized reuse or modification.

3 encryption levels for your sensitive data: 40 bit RC4, 128 bit RC4, and 128 bit AES.

Take full control over printing, copying, editing and more permissions for your PDF content.

Standalone and easy to use for users of all skill levels with user-friendly interface.

Available for:

Free Try Windows 11/10/8/7

Why Should You Choose Coolmuster PDF Locker?

add user and owner password to your pdf files

Safeguard Your Data with Password Protected PDFs

Discover the importance of password protecting your PDF files to ensure the safety and security of your valuable data. Protect your documents and keep sensitive information confidential at your will with this PDF encryption software now.

Add User Password: By configuring a User Password (or Open Password), you can regulate the access or opening permissions for your PDF file. Only those who know the user password can open your PDF.
Set Owner Password: Setting an owner password for your PDF allows you to modify permission settings, protecting your PDF from unauthorized reuse.

3 different security levels for your reference

Enhance Data Security with Three Levels of Encryption for Sensitive Information

Explore three powerful encryption levels to bolster the security of your sensitive data. Protect your information at different levels, ensuring utmost confidentiality and peace of mind.

40 bit RC4: Lowest password protection for individual PDF documents, preventing printing, copying, or editing.
128 bit RC4: Offers more detailed options to restrict PDF document usage.
128 bit AES: The highest level of password protection, utilizing Advanced Encryption Standard for stronger file security.

Gain Complete Control over PDF Permissions

Take charge of your PDF content by customizing permissions for printing, copying, editing, and other actions. Enjoy the flexibility to freely permit specific privacy settings while maintaining the overall security of your PDF document.

Easily set permissions for your PDF document, allowing content copying, modifying, annotation adding, document printing (high or low resolution), content copying for accessibility, form filling, and document assembly.
Import bulk PDFs and instantly protect them all with a single password using the PDF Locker.

User-Friendly Password Protection in PDF for All Skill Levels

Discover a standalone PDF protection solution that caters to users of all skill levels.

Effortlessly encrypt multiple PDF files with the drag-and-drop feature.
Enjoy an ad-free and virus-free software experience.
You can recover files one at a time or in a batch.
Encrypt your PDF files quickly and easily, regardless of their size.

Don't Take Our Word For It

I've been using Coolmuster PDF Locker for a while now, and I must say, it's an excellent software for securing PDF files. The password-based encryption feature works flawlessly, allowing me to protect sensitive documents with ease. I can restrict printing, copying, and editing, ensuring that my files are safeguarded from unauthorized access. The batch processing feature is a real time-saver, as I can protect multiple files simultaneously. Coolmuster PDF Locker has become an essential tool for maintaining the confidentiality of my PDF documents. Highly recommended!

- PDFbirdy

Coolmuster PDF Locker is a lifesaver when it comes to securing PDF files. The user interface is intuitive and user-friendly, making the encryption process a breeze. I can set up passwords for my PDF files and choose specific permissions, such as allowing printing but disabling copying. The software also supports batch processing, which is incredibly convenient when I have a large number of files to protect. Coolmuster PDF Locker provides effortless encryption, ensuring the privacy and integrity of my documents. I'm extremely satisfied with its performance!

- Isacboom

Coolmuster PDF Locker has made it incredibly simple for me to protect the integrity of my PDF files. I can easily disable editing features, preventing any unauthorized modifications to the documents. This has been particularly useful when sharing confidential reports or contracts with clients or colleagues. The software's compatibility with all versions of PDF files ensures that I can secure any PDF document, regardless of its format. Coolmuster PDF Locker gives me the confidence that my files are well-protected, and I highly recommend it to anyone who values document security.

- G. Ala

Our Customers Are Also Downloading