About
SysTools PDF Locker is a professional PDF protection software designed to secure confidential PDF documents from unauthorized access and misuse. It allows users to protect PDF files with strong user/open passwords and apply customized permissions to control printing, editing, copying, commenting, form filling, signing, and page extraction. The software supports advanced encryption standards, including AES 256-bit, AES 128-bit, RC4 128-bit, and RC4 40-bit, providing an additional layer of document security.
With its batch processing capability, users can lock multiple PDF files or entire folders in a single operation. SysTools PDF Locker works completely offline, so files are not uploaded to online servers, making it suitable for protecting sensitive business, financial, legal, and personal documents. The tool supports both Windows and macOS and does not require Adobe Acrobat. Its simple interface enables users to password-protect and restrict PDF files in just a few clicks while maintaining document integrity.