Lock PDF File

Add a secure password to your PDF document to prevent unauthorized access.

100% Secure: Uses local AES encryption. Files never leave your device.

Password Protect & Lock PDFs Free Online

Sharing sensitive documents like financial statements, legal contracts, or medical records requires top-tier security. Our Free PDF Locker empowers you to easily encrypt your PDF files with a strong password. Once locked, only individuals with the exact password will be able to open, view, or edit your document.

Bank-Grade Encryption with Zero Uploads

Unlike traditional online PDF tools that force you to upload your sensitive files to their cloud servers, our PDF Locker operates entirely on your device. We utilize advanced client-side processing to apply AES encryption locally. Your document and your password never leave your computer, ensuring absolute confidentiality.