PDF → Password Protected PDF

Secure your PDF files by encrypting them with a strong password. Protect sensitive information quickly and easily.

AES-256 Encryption: Military-grade security for your PDF documents

About this tool

The Add PDF Password tool encrypts your PDF files with AES-256 bit encryption, ensuring only people with the correct password can open and view your documents.

How to use:

Upload one or more PDF files
Enter a strong password of your choice
Click the Add Password Protection button
Download your encrypted PDF files

Features:

Applies AES-256 encryption for maximum security
Batch processing: protect multiple PDFs with the same password
Works entirely in the browser — no installations required
Protects sensitive and confidential information
Fast and secure — files auto-delete after processing

Notes:

Choose a strong, memorable password (at least 8 characters, mix of letters, numbers, and symbols)
If you forget your password, the file cannot be unlocked
File size and encryption strength may affect processing time

Common use cases

Legal documents - protect confidential legal agreements and contracts
Financial records - secure sensitive financial reports and statements
Personal documents - safeguard identification documents and personal records

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Frequently Asked Questions

What encryption standard does this tool use?

We use AES-256 encryption, which is the same standard used by banks and governments for securing sensitive data.

Can I add different passwords to multiple PDFs at once?

Currently, the batch processing feature applies the same password to all uploaded PDF files in a single operation.

What happens if I forget the password?

We cannot recover lost passwords. The encryption is designed to be secure, so please keep your password in a safe place.

Is there a file size limit for encryption?

We recommend files under 50MB for optimal performance, though larger files may also work.

Are my files stored on your servers?

No, your files are processed entirely in your browser and are never stored on our servers. They are automatically deleted after processing.

Can I remove password protection later?

Yes, with the correct password, you can use our Unlock PDF tool to remove password protection.

Is this PDF encryption tool completely free?

Yes, our PDF encryption tools are completely free to use with no hidden charges.