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.