Released in late 2024 with version 2.5.22, Coolmuster PDF Locker v2.5.22 is the easy-to-use PDF security tool from Coolmuster, allowing users to add password protection, set permissions, and encrypt PDF documents with strong AES encryption to prevent unauthorized viewing, printing, copying, or editing.
Key Highlights
- Open & Permission Passwords – Set user password for opening PDF and owner password for restricting printing, copying, and editing actions.
- Strong AES Encryption – Supports 128-bit and 256-bit AES encryption for high-level security compatible with Adobe Acrobat and other PDF readers.
- Batch Processing – Encrypt multiple PDF files at once with the same or different passwords for efficient workflow.
- Permission Customization – Fine-tune restrictions including disable printing, copying text/images, modifying content, adding annotations, and form filling.
- Drag-and-Drop Interface – Simple and intuitive drag-and-drop support for quick addition of PDF files with preview of protection settings.
- No Quality Loss – Encryption process preserves original PDF layout, formatting, images, and text without any degradation.
- Performance & Stability – Fast encryption speed, improved handling of large PDFs, and full compatibility with Windows 11.
System Requirements
- Windows 11 64-bit (or Windows 10 / 8 / 7)
- 4 GB RAM minimum (8 GB+ recommended)
- Integrated GPU sufficient
- NVMe SSD strongly advised