PDF Password Protect

Server-powered

Encrypt and password-protect PDF files online with AES-256 security. Free PDF protector with customizable permissions and access control.

Document Tools

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Upload PDF File

Drag and drop or click to select a PDF file (max 100 MB)

About PDF Password Protection

PDF password protection adds encryption to your PDF files, preventing unauthorized access and controlling what recipients can do with the document. The PDF specification supports two types of passwords and granular permission controls.

This tool processes everything in your browser. Your PDF files and passwords are never sent to any server, ensuring complete privacy and security for your most sensitive documents.

User Password vs. Owner Password

User Password (Open Password)

The user password is required to open the PDF. Without it, the document cannot be viewed at all. This is the primary access control and should be shared only with intended recipients.

Owner Password (Permissions Password)

The owner password controls document permissions such as printing, copying, and editing. The document owner uses this to manage restrictions. It should be kept private and differ from the user password.

PDF Encryption Standards

AES-256 Encryption

The strongest encryption standard for PDFs. AES-256 (Advanced Encryption Standard with 256-bit keys) is virtually unbreakable with current technology and is the same standard used by governments and military organizations.

AES-128 Encryption

A widely supported encryption standard that provides strong security. While slightly less robust than AES-256, it is still considered secure for most use cases and has broader compatibility with older PDF readers.

RC4 Encryption (Legacy)

An older encryption method (40-bit or 128-bit) still found in legacy PDFs. RC4 is no longer considered secure and should not be used for sensitive documents. Always prefer AES-based encryption for new files.

Best Practices for PDF Security

Use Strong Passwords

Combine uppercase and lowercase letters, numbers, and special characters. Aim for at least 12 characters. Avoid dictionary words, names, and common patterns like "123456" or "password".

Different Passwords for User and Owner

Always use different passwords for user (open) and owner (permissions) access. If they are the same, the user effectively gains owner privileges and can remove restrictions.

Share Passwords Securely

Never send the password in the same email as the PDF. Use a different communication channel (SMS, phone call, secure messaging) or a password manager's sharing feature.

Consider Your Audience

Think about whether recipients need to print or copy text. Overly restrictive permissions can frustrate legitimate users. Balance security with usability based on your specific needs.

Privacy & Security

Secure Server Processing: Your PDF is encrypted on our server using AES-256 via PyMuPDF and immediately returned. Files are never stored on disk.

Zero Data Retention: We do not store, log, or retain any file data, passwords, or usage information. Your documents are processed in memory and discarded immediately after encryption.

How to Use PDF Password Protect

Open PDF Password Protect

Navigate to PDF Password Protect in your browser.

Upload your file

Click the upload area or drag and drop your file. It will be securely processed on our servers.

Configure settings

Adjust any available options such as quality, format, or output preferences.

Download the result

Once processing is complete, click Download to save the output file to your device.

Frequently Asked Questions

PDF Password Protect is a free online document processing tool. Encrypt and password-protect PDF files online with AES-256 security. Free PDF protector with customizable permissions and access control.