Protect PDF Online – Add Password to PDF

How to Password Protect PDF Files Online

1. Upload PDF: Click Choose File or drag and drop your confidential PDF into the tool.
2. Set Password: Enter a strong password and re-enter it to confirm encryption.
3. Download Encrypted PDF: Click Protect PDF to instantly lock your document with 128-bit/256-bit AES encryption.

Key Features of PDF Birds PDF Protection Tool

• Military-Grade AES Encryption: Safeguard sensitive bank statements, contracts, and personal records against unauthorized access.
• Custom Permissions: Restrict opening, viewing, printing, or copying of your confidential content.
• 100% Free & Unlimited: Encrypt multiple files without subscriptions, hidden paywalls, or software downloads.
• Strict Privacy: Files are processed through encrypted SSL channels and deleted permanently from our servers immediately after processing.

Frequently Asked Questions (FAQs)

Can an encrypted PDF be opened without the password?

No, standard AES encryption ensures no one can view or open the file unless they enter the exact password you set.

What if I ever need to remove the password later?

If you know your password and want to remove protection permanently, use our Unlock PDF Tool.

What if my protected document is too large to email?

You can optimize and shrink its file size beforehand using our Compress PDF Tool.

Can I sign my confidential agreement before locking it?

Yes, fill and sign your documents using our Fill & Sign PDF Tool before applying a password.

Explore Related PDF Tools

• Remove password from PDF: Unlock PDF
• Reduce document file size: Compress PDF
• Fill and add signatures: Fill & Sign PDF
• Combine multiple protected files: Merge PDF