Add PDF passwords
Protect PDF files with a password using AES-256 encryption before sharing them.
Available nowWindows 10+Windows 11Android planned
PDF LockSmith
Lock and unlock PDF files locally
PDF LockSmith is a focused desktop utility for adding password protection to PDF files or removing protection when you know the password. Drop a file, lock or remove its password, and the result saves automatically — nothing leaves your machine.
Product notes
Built for fast, local PDF protection tasks.
Remove passwords
Remove protection from PDFs when you know the correct password.
Drag & drop PDFs
Drop a PDF into the app and start a lock or unlock workflow quickly.
Auto-save to folder
Locked and unlocked files save automatically next to the original or to a custom output folder.
Remember passwords
Optionally save passwords per file so you don't have to re-enter them.
Compact accessible UI
A small fixed-window interface with keyboard navigation, screen reader support, and high-contrast colors.
Local-first workflow
Files are processed on your device using bundled QPDF — nothing leaves your machine.