PDF Locker

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About this app

Keep sensitive PDFs private with simple, on-device password protection.

PDF Locker lets you choose a PDF, create a password, and save an encrypted copy in a private vault on your Android device. Your PDF contents and passwords are not uploaded by PDF Locker.

Key features:

• Protect PDFs with AES-256 encryption
• Process documents locally on your device
• Keep protected copies together in a private vault
• Open, share, or save a protected copy whenever you need it
• Prevent editing and text extraction from protected copies
• Choose your own password with confirmation to avoid typing mistakes
• No account or sign-in required

How it works:

1. Tap “Lock a PDF” and choose a document.
2. Enter and confirm a password of at least 8 characters.
3. PDF Locker creates an encrypted copy and adds it to your vault.
4. Share it or save a copy to a location you choose.

Your original PDF is left unchanged. Passwords are never stored, so keep yours somewhere safe. Files already protected by a password must be unlocked before PDF Locker can protect them again.