Protect PDF
Add password protection to your PDF documents
Drop a PDF file here
or click to browse
Max 1 files, up to 100 MB each
Strong Encryption
AES-256 encryption standard
Two Passwords
Owner and user passwords
Permission Control
Control printing and editing
About Protect PDF
PDFNinja's Protect PDF tool helps you secure your PDF documents with password protection. Add encryption to prevent unauthorized access, control printing and editing permissions, and keep your sensitive documents safe. Our free online tool uses industry-standard AES-256 encryption to protect your PDFs. Simply upload your PDF, set passwords, configure permissions, and download your protected document.
Key Benefits
- Industry-standard encryption
- Free to use
- No registration required
- Browser-based processing
- Secure local handling
- Instant protection
Features
- AES-256 encryption
- Owner and user passwords
- Printing permissions
- Editing restrictions
- Copy protection
- No upload required
Common Use Cases
- Secure business documents
- Protect personal files
- Restrict document access
- Control document permissions
- Share sensitive PDFs safely
Privacy Guaranteed
All processing happens locally in your browser. Your files are never uploaded to any server, ensuring complete privacy and security.