Protect PDF: Password Lock

Protect PDF: Password Lock helps you protect PDF files with a password, unlock PDF documents when you know the current password and change PDF passwords in a focused offline workflow.

Use it when you need a simple PDF password tool for private documents, invoices, contracts, forms, study notes or files you want to share more safely. Import a PDF, choose Protect, Unlock or Change Password, then save or share the processed file.

Key features:
• Protect PDF files with an opening password
• Unlock PDF files when you have the correct password
• Change PDF passwords without starting from scratch
• Generate strong passwords and copy them to the clipboard
• Allow or block printing when creating a protected PDF
• Allow or block text copying when protecting a file
• Save, share and export protected or unlocked PDFs
• Local history for recently processed documents
• Clean interface with light and dark mode

Private by design:
Your PDF files are processed on your device. There is no account flow and no need to upload your documents to a server to protect, unlock or change a PDF password.

Protect PDF is built for users who want a fast PDF lock app, a PDF unlock tool and a PDF password changer in one place. The app focuses on security tasks instead of adding a heavy all-in-one editor.

All PDF features are available in the app. An optional one-time purchase removes ads.

Important:
You must know the current password to unlock a strongly protected PDF or change its password. Keep your new password somewhere safe.