Encrypt PDF
Protect PDF files directly in your browser with AES-256 encryption, no upload, and optional permissions.
Input
Private by design: your PDF files and passwords never leave your device.
Encrypted PDFs are not PDF/A-compliant. Digital signatures become cryptographically invalid.
Security
Use at least 16 characters and no reused password.
Weak
One opening password, all normal PDF functions allowed. The generated permissions password is not stored. Use Advanced if you want to manage security settings later in a PDF editor.
Output
One encrypted PDF is created per source. Multiple results are also provided as a ZIP file.