PDF Security
100% Client-Side Privacy
Client-side PDF Encryption Engine
Protect PDF
Add password encryption to your PDF document to prevent unauthorized opening and viewing. Uses standard client-side PDF encryption.
Select or drop PDF to password-protect
Genuine AES-256 client-side encryption. Document cannot be opened without your password.
Browse Fileor Paste (Ctrl+V)
Supported: .pdf, application/pdf (Max 60 MB)
How to Use Protect PDF
Follow these easy steps to process your file right in your browser.
1Step 1
Choose PDF to protect
Upload the confidential PDF document.
Instant local processing
2Step 2
Set password
Enter a strong password and confirm it. Note: Be sure to remember your password, as files cannot be recovered without it.
Instant local processing
3Step 3
Encrypt document
Click "Protect PDF". The encryption dictionaries are configured.
Instant local processing
4Step 4
Download locked PDF
Save your password-protected PDF.
Instant local processing
Frequently Asked Questions
Common questions about Protect PDF and browser processing.
Because processing is local and zero-knowledge, no password copies are stored anywhere. Keep your password in a safe password manager.
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