Encrypt PDF documents with a password to prevent unauthorized access. Set permissions for printing, copying text, copying graphics, and modifying content. Uses AES-256 encryption.
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Encrypt PDF documents with a password to prevent unauthorized access. Set permissions for printing, copying text, copying graphics, and modifying content. Uses AES-256 encryption.
Reviewed: 2026-09-18
Follow this step-by-step guide.
Step 1
Click or drag to upload your file.
Step 2
Adjust any settings if available.
Step 3
Click the action button to process your file.
Step 4
Download the processed file.
Consequence: If someone discovers the open password, they automatically get full edit permissions.
Fix: Use different passwords for opening and modifying the PDF.
Consequence: Without the owner password, you cannot modify the protection settings later.
Fix: Store the owner password in a secure password manager immediately after setting it.
Consequence: Short passwords can be cracked quickly by brute-force tools.
Fix: Use a strong password with at least 12 characters including mixed case, numbers, and symbols.
Consequence: Short or simple passwords can be cracked quickly by brute-force tools.
Fix: Use a strong password with at least 12 characters including mixed case, numbers, and symbols.
Add password encryption to a document before sending it through channels that do not provide end-to-end confidentiality.
Encrypt an archived document so stored copies remain unreadable if storage media are lost or accessed.
Example usage.
It processes your files entirely in your browser. No data is uploaded to any server.
The tool uses AES-256 encryption for owner and user passwords. Both passwords are optional — you can set just the user password for viewing restriction.
You can set a password to open the PDF and restrict printing, copying, and editing.
You can set user passwords (required to open), owner passwords (required to modify), and permission flags for printing, copying, editing, and annotating. The tool uses AES-256 encryption for maximum security and supports both 128-bit and 256-bit key lengths.
The tool uses AES-256 encryption, which is the same standard used by banks and governments. With a strong password, cracking the encryption would require billions of years of computation. The encryption is applied locally in your browser — no data is transmitted.
The user password controls who can open the PDF. The owner password controls editing permissions.
You can set owner-only restrictions without requiring a password to open the file.
The tool uses AES-256 encryption, the industry standard for PDF protection.
PDF Protect encrypts the uploaded document entirely inside this browser tab using the Web Crypto standard; the password and page content never leave the device. Files are used only on explicit user action, and the page continues to work offline after the initial load.
