Protect Your PDFs with Password Encryption
Add military-grade encryption and password protection. 100% browser-based - your files never leave your device.
Loading PDF protection tool...
Related PDF Tools
Why Choose Our PDF Protection Tool?
The only truly private PDF encryption solution
100% Browser-Based Processing
Unlike competitors who require uploading to servers, all encryption happens locally in your browser. Your files never leave your device.
Military-Grade AES 256-bit Encryption
Industry-standard encryption that would take billions of years to crack with modern computers.
No File Size or Quantity Limits
Protect unlimited PDFs of any size. No subscriptions, no daily limits, completely free forever.
Real-Time Password Strength Analysis
Visual feedback shows your password strength and estimated crack time. Generate ultra-strong passwords with one click.
Granular Permission Controls
Control exactly what users can do: printing quality, content copying, editing, annotations, form filling, and more.
Completely Free, Forever
No hidden fees, no subscriptions, no premium tiers. All features are free for everyone.
How to Password Protect a PDF
Secure your documents in 4 simple steps
Upload Your PDF
Drag and drop your PDF or click to browse. Your file stays in your browser throughout the entire process.
Set a Strong Password
Enter a password to open the PDF. Use our password generator for maximum security, and check the strength meter.
Configure Permissions (Optional)
Set a separate permissions password and control printing, copying, editing, and other document permissions.
Download Protected PDF
Get your encrypted PDF instantly. Test it by trying to open it - you'll need your password!
Advanced Security Features
Professional-grade PDF protection
Open Password Protection
Require a password to view the PDF. Without the correct password, the document cannot be opened at all.
Permissions Password
Set a separate password that controls editing, printing, and copying. Users can view the PDF but need this password to modify it.
Choose Encryption Strength
Select between AES 128-bit (fast, highly secure) or AES 256-bit (maximum security, slightly slower). Both are unbreakable with current technology.
Fine-Grained Permission Control
Control printing quality, content modification, text copying, annotations, form filling, accessibility features, and document assembly.
Common Use Cases for PDF Protection
When should you password protect your PDFs?
Confidential Business Documents
Protect sensitive business plans, financial reports, and strategic documents from unauthorized access.
Legal Contracts & Agreements
Secure contracts and legal documents, preventing unauthorized modifications while allowing viewing.
Financial Records
Protect tax returns, bank statements, and accounting documents containing sensitive financial data.
Personal Documents
Secure personal records like medical files, ID documents, and private correspondence.
Client Deliverables
Protect work delivered to clients, controlling whether they can print, copy, or modify the content.
Internal Communications
Secure company memos, HR documents, and internal reports distributed to employees.
Frequently Asked Questions
Is this PDF password protection tool secure?
Yes, extremely secure. All encryption happens in your browser using the same AES encryption that banks and governments use. Your files never touch our servers.
What encryption algorithm is used?
We use AES (Advanced Encryption Standard) with your choice of 128-bit or 256-bit keys. AES-256 is approved by the NSA for TOP SECRET information.
Do you upload my PDF to your servers?
No, never. Unlike other tools, we process everything in your browser. Your PDF never leaves your device, ensuring complete privacy.
How strong should my password be?
Use at least 12 characters with a mix of uppercase, lowercase, numbers, and symbols. Our strength meter shows real-time security analysis. Use the password generator for maximum security.
Is this really completely free?
Yes! No trials, no subscriptions, no hidden fees. All features are free because processing happens in your browser, not on expensive servers.
What's the difference between user password and owner password?
The user password is required to open and view the PDF. The owner password controls permissions like printing, copying, and editing. You can set both or just the user password.
What if I forget the password?
PDF encryption is irreversible. If you forget the password, the file cannot be recovered. Make sure to store your password securely.
Can I protect multiple PDFs at once?
Currently, protect one PDF at a time with custom passwords. Since it's so fast (1-2 seconds per file) and unlimited, you can process many files quickly.
Will the protected PDF work everywhere?
Yes! We use standard PDF encryption supported by all major PDF readers including Adobe Acrobat, Chrome, Edge, Firefox, and mobile PDF apps.
How is this different from other PDF encryption tools?
Most tools require uploading to their servers (privacy risk), have file size limits (3-100MB typical), and limit free conversions. We process everything locally, have no limits, and are completely free.
Ready to Secure Your PDFs?
Add password protection now - free, unlimited, and completely private
Protect Your PDF