Encrypt Your PDF with a Password in Seconds
Add strong password encryption to confidential business agreements, financial statements, and sensitive tax forms.
Quick Definition & Overview
PDF password protection applies standard ISO 32000 256-bit AES cryptographic algorithms to restrict unauthorized viewing and extraction.
- Standard 256-bit AES cryptographic encryption
- Enforces password prompt in all compliant PDF viewers
- Zero password logging or retention in memory
Input
PDF
Output
PDF
Security
Auto-Deleted
Cost
100% Free
How to use Protect PDF
- Upload Sensitive PDFSelect the document you wish to encrypt.
- Enter Strong PasswordType your chosen password into the security field.
- Encrypt DocumentClick 'Process Protect PDF' to apply AES encryption.
- Download Protected PDFSave your encrypted document.
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Frequently Asked Questions
Can SmartAssPDF recover lost passwords?
No. Standard AES encryption mathematically scrambles the file stream; please keep a safe record of your password in a password manager.
What encryption standard is used?
SmartAssPDF uses 256-bit AES (Advanced Encryption Standard), the same encryption standard used by governments and financial institutions. It is the strongest encryption level supported by the PDF specification.
What happens if I forget the password?
There is no password recovery. SmartAssPDF does not store passwords or any record of your document. Please store your password safely before applying protection.
Can I set different permissions (print-only, no editing)?
The current tool applies a user-open password with standard permission flags. For granular per-permission controls (print-only, no copy, no edit), the PDF specification requires setting both a user password and an owner password — this is on our development roadmap.