# Protect PDF

> Add password protection and encryption to your PDF documents. Secure sensitive information with industry-standard encryption.

**Category:** Security
**Plan:** Free


## Features

- Password protection
- Permission restrictions
- Prevent copying/printing
- AES encryption
- Set document permissions
- Client-side encryption

## How to Use

1. Upload your PDF
2. Set a password
3. Choose permission restrictions
4. Click "Protect" and download

## Frequently Asked Questions

### What encryption is used?

AES-256 encryption for maximum security.

### Can I prevent printing?

Yes, set permissions to disable printing.

### Is the password stored anywhere?

No, processing happens client-side and passwords are never stored.

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**Tool URL:** https://pdfflo.com/protect
**API Documentation:** https://pdfflo.com/api-docs
**OpenAPI Spec:** https://pdfflo.com/openapi.json

*Last Updated: 2026-04-19*