PDF Lock & Unlock Tool
Secure your PDFs with passwords or unlock PDFs you have permission to access
Choose Operation
Lock PDF
Add password protection to a PDF file to restrict viewing, printing, or editing.
Unlock PDF
Remove password protection from a PDF file if you have the correct password.
Drop PDF file here or click to browse
Supports PDF files up to 50MB
Password Settings
Owner password grants full control (edit, print, copy). Keep this secure.
User password only allows viewing. Leave empty for no viewing restrictions.
Password Requirements
How It Works
Upload PDF File
Select the PDF file you want to lock or unlock. File processing happens entirely in your browser.
Set Password & Permissions
For locking: Set owner/user passwords and choose permissions. For unlocking: Enter the existing password.
Process & Download
Click the process button. Your modified PDF will be ready for download instantly.
Security Guarantee
All processing happens locally in your browser. Your PDF files and passwords never leave your computer. We don't store or have access to any of your data.
Security Features & How to Use
Locking PDF Files
Two Password System
Owner Password: Full control (edit, print, modify permissions).
User Password: View-only access (optional).
Granular Permissions
Control exactly what users can do: printing, copying, modifications, annotations.
Strong Encryption
Uses industry-standard 128-bit RC4 encryption to secure your PDF files.
Unlocking PDF Files
Legitimate Access Only
This tool is for unlocking PDFs you legally have permission to access. You must know the password.
Preserve Original Quality
Unlocking doesn't degrade PDF quality. All content remains exactly as in the original.
Export Without Restrictions
After unlocking, you can print, edit, copy, or share the PDF without restrictions.
Common Use Cases
Business Documents
Protect confidential reports, contracts, and financial documents.
Academic Work
Secure research papers, theses, and academic publications.
Legal Documents
Protect sensitive legal agreements and confidential files.