Unlock and Lock PDF - pdfsmith

Please Note: You need to know the pdf file password to unlock it.

PDFSmith is a fast and privacy focused PDF security app that helps you unlock PDFs, remove PDF passwords, lock PDFs, add passwords to PDF files, and change existing PDF passwords directly on your device.

This app is designed for users who need a reliable PDF unlocker and PDF locker without uploading files to the cloud. All processing happens locally on your phone, ensuring maximum privacy and security.

Unlock PDF files easily
Remove password protection from PDFs when you know the correct password. PDFSmith works as a safe and legitimate PDF password remover that requires the original password. The app does not bypass, crack, or weaken PDF encryption.

Lock PDF files with a password
Add password protection to PDF files to keep sensitive information secure. PDFSmith allows you to lock PDFs quickly before sharing or storing them.

Change PDF passwords
Update or replace an existing PDF password without recreating the document. This makes it easy to maintain security over time.

Offline PDF unlocker and locker
PDFSmith works completely offline. No internet connection is required to unlock PDFs, remove passwords, or add password protection. Your files never leave your device.

Private and secure by design
PDFSmith does not upload, store, or transmit your PDF files or passwords. Everything stays on your device, making it ideal for confidential documents and professional use.

Fast and instant results
Unlock PDFs or lock PDFs in seconds with instant on device processing. No waiting, no file size limits imposed by servers.

Easy saving and sharing
Save unlocked or locked PDF files instantly and share them using your device’s standard sharing options.

Perfect for many use cases
This app is useful for professionals handling confidential documents, students managing coursework, travelers working offline, and anyone who needs a secure PDF password remover or PDF locker.

Key features
PDF unlocker using the correct password
PDF password remover with password verification
PDF locker to add password protection
Change PDF password easily
Offline PDF processing
On device PDF security
No cloud uploads
Instant results

PDFSmith gives you full control over your PDF files with a secure, offline, and easy to use PDF unlocker and PDF locker.