PDF Tools
Lock PDF with Password
Password-protect your PDF with AES-256 encryption. Set user and owner passwords. Browser-based — file never uploaded.
🔒 Runs in your browser — files never leave your device
📂 Upload PDF
🔐
Drop a PDF here or click
File stays on your device
🔑 Password Settings
About Lock PDF
Protect sensitive PDFs with AES-256 encryption. Set a user password to control who can open the file, and an owner password to restrict printing and editing.
Frequently Asked Questions
What encryption?
AES-256 — the strongest PDF encryption standard.