PDF Unlock & Lock

PDF Unlock & Lock helps you work with PDF passwords directly on your device.

Use it to save an unlocked copy of a PDF when you already know the password, or add a new open password to an unprotected PDF. Files are processed locally, so sensitive contracts, certificates, business documents, and personal files do not need to be uploaded to a server.

Main features:
- Unlock PDFs when you know the current password
- Add an open password to unprotected PDFs
- Process multiple PDF files in sequence
- Save or share processed files
- Open PDFs from Files or the Android share menu

Important:
- This app does not recover, crack, or guess PDF passwords.
- You need the current password to create an unlocked copy.
- If you forget a new password, the app cannot recover it.