Is the PDF Protector free to use?

Yes, our PDF Protector is completely free with no hidden charges, subscription fees, or registration requirements. You can protect as many PDFs as you need without any limitations.

What encryption methods are available?

We offer two encryption methods: 1) Server-side standard PDF password protection (creates password-protected PDFs readable by any PDF viewer), and 2) Client-side AES-GCM encryption (creates custom .enc files with enhanced security that require our decryption tool).

Are my PDF files secure during protection?

For client-side encryption, all processing happens directly in your browser. We never upload, store, or access your PDF files. For server-side encryption, files are uploaded securely via HTTPS and deleted immediately after processing. Your documents remain private and secure.

What is PBKDF2 and why is it used?

PBKDF2 (Password-Based Key Derivation Function 2) is a key derivation function that applies a pseudorandom function to the password along with a salt value and repeats the process many times (150,000 iterations). This makes brute-force attacks significantly more difficult and time-consuming.

What is AES-GCM encryption?

AES-GCM (Advanced Encryption Standard - Galois/Counter Mode) is a modern authenticated encryption algorithm that provides both confidentiality and integrity. It's widely recognized as secure and efficient, used by governments and security experts worldwide.

Can I recover a PDF if I forget the password?

No, password recovery is not possible. The encryption is designed to be irreversible without the correct password. We never store passwords, so it's essential to remember your password or store it securely using a password manager.

What's the difference between server-side and client-side encryption?

Server-side encryption creates standard password-protected PDFs that can be opened by any PDF viewer. Client-side encryption uses AES-GCM to create custom .enc files that offer enhanced security but require our decryption tool to open. Client-side is more secure as files never leave your device.

Are there any file size limits?

There are no strict file size limits. The tool can handle large PDF files efficiently. Performance depends on your device's capabilities, but documents of several hundred MB typically work well with both encryption methods.

PDF Protector

Encrypt your PDF with password protection using PBKDF2 + AES-GCM. Keep sensitive data confidential and secure.

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Supports: Single PDF file

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Security Features

PBKDF2 key derivation (150,000 iterations)

AES-GCM encryption with random IV

Server-side: Standard PDF password protection

Client-side: Custom AES-GCM encryption

No file uploads for client-side encryption

Secure random number generation

Download history with local storage

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Protection History

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PDF Protector

Protect PDF File

Drop your PDF here to protect

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Protection History

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Frequently Asked Questions

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