What is PDF encryption?

PDF encryption protects your documents by encoding the content with a password. Only users with the correct password can open or access the file, ensuring your sensitive information stays private.

What is the difference between user and owner password?

The user password is required to open the PDF. The owner password allows changing permissions and security settings. You can set one or both passwords for different levels of protection.

What encryption levels are available?

We offer 40-bit (basic), 128-bit (standard), and 256-bit AES (maximum security). We recommend 256-bit AES encryption for best protection - it's the strongest PDF encryption standard available.

Can I protect multiple PDFs at once?

Yes, upload up to 20 PDFs and apply the same password and permissions to all files in one batch operation. This saves time when securing multiple documents.

Is it safe to protect PDFs online?

Absolutely! All encryption happens directly in your browser using WebAssembly. Your files never leave your device, and we never see your passwords or documents. It's completely private and secure.

PDFyogi

Protect PDF

Add password protection and set permissions for your PDF files. Control who can open, print, copy, or modify your documents. Perfect for securing sensitive information.

or Drag & drop files here

Max 100 files•Max file size: 100MB

Supported formats: .pdf, application/pdf

Professional PDF Protection Tool

Secure your PDF documents with password protection and granular permission controls. Our browser-based tool uses 256-bit AES encryption processed entirely on your device, allowing you to restrict printing, copying, editing, and other actions while ensuring your passwords and documents remain completely private.

Key Features:

✓256-bit AES encryption for maximum security
✓Set user password (open) and owner password (permissions)
✓Control printing, copying, editing, and form filling permissions
✓Batch protect multiple PDF files simultaneously
✓100% client-side processing for complete privacy
✓No password storage or transmission to servers

How to protect PDF files:

Click "Select PDF Files" or drag and drop your PDFs
Set a user password (required to open) and optionally an owner password
Choose what actions are allowed (printing, copying, modifying, etc.)
Click "Protect PDF" to apply encryption and restrictions
Download your password-protected PDF file

Your Privacy is Protected

All conversions happen locally in your browser. Your files never leave your device and are automatically deleted when you close this page.

Frequently Asked Questions

PDF

Start converting

More Tools

All tools are completely free and process files locally in your browser for maximum privacy.

Your Privacy is Our Priority

Unlike other PDF tools, we process your files directly in your browser using WebAssembly technology. This means your sensitive documents never leave your device.

Browser Processing

Processing happens in your browser

No File Uploads

No files uploaded to our servers

No Storage

We don't permanently store your files

Complete Privacy

Your files never leave your device during processing

100% Privacy Guarantee

We use cutting-edge WebAssembly technology to process your PDFs entirely within your browser. No uploads to our servers, no data collection, no privacy concerns. Just pure, local processing power.

Read our Privacy Policy

How Our Privacy-First Technology Works

WebAssembly Processing

We use WebAssembly (WASM) to run PDF processing libraries directly in your browser, eliminating the need to upload files to external servers.

Local Storage Only

Files are temporarily stored in your browser's memory during processing and automatically cleared when you close the tab or complete the task.

No Data Collection

We don't track, store, or analyze your file contents. Our analytics only measure tool usage patterns, not personal data.

GDPR Compliant

Our privacy-first approach means we're automatically compliant with GDPR, CCPA, and other privacy regulations worldwide.

Protect PDF Online - Add Password Protection to PDF | PDFyogi