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Protect PDF files

Encrypt PDF documents with strong AES passwords and restrict unauthorized access.

or drop PDF here
100% In-Browser & Zero-Upload Privacy
Instant High-Performance Processing
Max 80 MB • Free Forever
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How to Protect PDF Online for Free

Follow these quick, easy steps to process your files securely inside your web browser.

Step 1

Upload Document

Select the file you need to protect.

Step 2

Set Password

Enter a strong password and confirm it.

Step 3

Set Permissions

Optionally disable printing and content copying.

Step 4

Download Protected PDF

Save your encrypted file; it now prompts for a password on open.

Why Use BizAiPro Protect PDF?

Standard 128-bit / 256-bit AES encryption protection
Custom user password required to open and view the document
Optional permission restrictions: prevent printing or text copying
Fully client-side encryption ensures secret passwords never touch a server

Frequently Asked Questions about Protect PDF

Will the password be required in all PDF viewers?

Yes. Adobe Acrobat, Apple Preview, Google Chrome, and mobile viewers all enforce the password.

Are my files and documents uploaded to any server?

No. BizAiPro processes your documents 100% locally in your web browser using client-side WebAssembly and modern JavaScript. Your files never leave your computer.