Free PDF Lock | Password Protect PDF Online
Password protect any PDF — works completely in your browser, no upload required.
Drop your PDF here or click to browse
Supports any PDF file
Encrypt PDF Without Upload
Common Use Cases for PDF Lock
- Confidential Documents: Password-protect sensitive PDFs containing financial information, personal data, or trade secrets.
- Client Deliverables: Encrypt PDFs before sending to clients to ensure only authorized recipients can access content.
- Secure Sharing: Add password protection when sharing documents via email, cloud storage, or file transfer services.
- Compliance Requirements: Meet security regulations by encrypting PDFs containing regulated data like HIPAA or GDPR protected information.
- Version Control: Prevent unauthorized editing or modification by setting document permissions and encryption.
- Legal Protection: Secure legal documents, contracts, and agreements to prevent tampering and unauthorized distribution.
How It Works
1. Upload PDF
Drag-and-drop or click to select the PDF you want to protect.
2. Set Password
Enter and confirm a password. Optionally set an owner password and fine-tune permissions.
3. Lock & Download
Click lock to encrypt and download the protected PDF instantly — all in your browser.
Frequently Asked Questions
Continue Your Workflow
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PDF Unlock
Remove password protection
Remove password protection from any PDF — unlock and save, entirely in your browser.
PDF Compress
Compress before locking
Reduce PDF file size without losing quality. Adjust image resolution, quality, and more.
PDF Merge
Merge then protect multiple PDFs
Merge multiple PDF files into a single document. Drag-and-drop to reorder.
PDF Reader
View PDF details
Open and view PDF files in your browser. Inspect metadata and document properties.
PDF Signature
Sign before locking
Add a visual signature to your PDF — draw, type, or upload a signature and place it on any page.