Protect PDF

Add password encryption to your PDF files.

Select PDF file

or drag and drop PDFs here

About Protect PDF

A PDF containing salary information, medical records, or legal agreements should not be readable by anyone who receives it accidentally. Password protection is the simplest security layer — if you don't have the password, you cannot open the file. Mini Tool adds AES-256 password encryption to any PDF directly in your browser. The encryption happens on your device before the file is downloaded — we never see the document or the password you choose. Share the password separately and your document stays private end to end.

How to use Protect PDF

  1. Upload your PDF: Choose the document you want to encrypt before sharing.
  2. Set a strong password: Pick a password you will share through a separate secure channel.
  3. Apply encryption: AES-256 protection is applied locally in your browser.
  4. Download the protected file: Send the PDF and password separately to recipients.

Common uses for Protect PDF

HR

Encrypt offer letters and payroll reports sent by email.

Healthcare

Add a password layer to patient information PDFs.

Legal

Protect drafts and settlement documents in transit.

Finance

Secure tax packets and bank statements shared with advisors.

Why use Mini Tool for Protect PDF?

AES-256 encryption

Industry-standard encryption applied before the file leaves your device.

Immediate protection

Encrypt in seconds without uploading confidential content.

No per-file fees

Protect unlimited PDFs without a subscription.

Compatible output

Protected files open in major PDF readers that support standard encryption.

Sharing passwords safely

Encrypting the PDF is only half the workflow. Send the password through a different channel than the file— for example, email the PDF but text the password.

Avoid weak passwords like birthdates or document titles. A random 12+ character passphrase dramatically reduces brute-force risk if a file is intercepted.

Frequently Asked Questions

What happens if I forget the password?
Passwords cannot be recovered. Store passwords in a manager or share them securely with recipients.
Is AES-256 secure enough?
AES-256 is widely used for document encryption. Strength also depends on choosing a long, unique password.
Can recipients still print?
This tool sets an open password. Advanced permission restrictions depend on the PDF reader.
Do you know my password?
No. Encryption runs locally and we never receive your file or password.
Can I protect already protected files?
Unlock first with the current password, then apply a new password if needed.