Protect PDF
Password protect PDF files and control document permissions directly in your browser. Set open passwords, restrict printing & copying, and encrypt documents 100% privately.
Upload PDF to Protect
Drag & drop your PDF here, or click to browse files from your device.
Maximum file size: 100 MB • Supported format: .PDF
How PDF Password Protection Works
Open Password Security
Encrypts document streams using AES-256 so viewers cannot open or render pages without entering the password.
Permission Control
Encodes restriction flags into the PDF security handler to control printing quality, text extraction, and modifications.
Zero File Uploads
All cryptography and page structures are processed locally in your browser. Files and passwords stay on your machine.
Frequently Asked Questions
What does PDF protection do?
PDF protection encrypts the internal binary streams of your document using real AES-256 or RC4 algorithms. It requires users to enter a valid password to open the file and encodes permission restrictions for printing, text copying, and editing.
Is my PDF file or password uploaded to any server?
No! 100% of the PDF encryption and permission processing happens locally inside your browser using client-side JavaScript. Your files and passwords never leave your device.
Can I restrict printing and text copying?
Yes. You can configure granular permission settings for high-resolution printing, low-resolution printing, text/image extraction, document modification, and form filling.
What is the difference between an Open Password and Permissions?
An Open Password (User Password) prevents unauthorized users from opening or viewing the PDF without entering the password. Permission settings control what actions (such as printing or copying text) users can perform once the document is opened.
Is PDF password protection secure?
Yes. When encrypted with AES-256 encryption and a strong password, PDF protection is cryptographically secure against unauthorized access.
Are permission settings enforced by all PDF readers?
Permission settings are standard PDF security flags encoded into the document structure. Most standard PDF viewers (such as Adobe Acrobat) strictly enforce them, though third-party software compliance may vary.