Password Protect PDF
Drag and drop your PDF here, or click to browse. Lock files instantly with strong AES-256 encryption.
Encryption Setup
Local Client-Side PDF Locker
Add strong password protection to PDF documents locally. Keep confidential files safe using modern AES-256 standard encryption algorithms without server uploads.
AES-256 Protection
Locks and encrypts your PDF files using highly secure Advanced Encryption Standard (AES) with 256-bit password locks.
Visual Strength Meter
Analyze your password strength dynamically to verify that your document lock is resistant to brute force attempts.
Password Visibility Toggle
Toggle mask views on password characters to avoid spelling typos while maintaining confidentiality in shared workspaces.
100% Sandbox Privacy
PDF document protection is compiled completely inside your local browser memory. No servers, no logs, full security.
Local System Limits
Standard browser capabilities enable fast processing for all hardware. Support depends on browser memory constraints.
Size & Volume Allocations
- Individual File LimitsMax 100MB per document. Restricting single document size protects the browser parser from execution locks.
- Page Count Safety CapMax 250 total input pages. Capping input ranges protects active memory and maintains responsiveness.