Settings

PDF Lock

Password protect any PDF — works completely in your browser, no upload required.

Drop your PDF here or click to browse

Supports any PDF file

Your files never leave your browser. All encryption is performed client-side using JavaScript — zero server communication, zero data collection.

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.

Drag-and-drop or click to select the PDF you want to protect.

Enter and confirm a password. Optionally set an owner password and fine-tune permissions.

Click lock to encrypt and download the protected PDF instantly — all in your browser.