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Protect PDF with Password — Free Online Encryption

Encrypt your PDF and set a password to restrict who can open, copy or print it.

Drop a PDF here

One PDF at a time

— or —
Browse File

Protecting sensitive PDFs with a password is essential for legal documents, financial records, confidential reports and personal files. QuackPDFTools encrypts your PDF with RC4 encryption directly in your browser — your password and file never leave your device.

Step by step guide

1
Upload your PDF
Drop the PDF you want to protect into the upload area.
2
Set a password
Enter a strong open password. Optionally set an owner password to restrict printing and copying.
3
Download protected PDF
Click Protect and Download — open the file in any PDF viewer to verify the password works.

Common uses

  • ✓ Protect confidential legal documents
  • ✓ Secure financial records and bank statements
  • ✓ Lock personal ID or passport scans
  • ✓ Restrict editing on official forms
  • ✓ Send private documents safely by email

Frequently asked questions

What encryption does this use?

RC4-40 bit encryption using the PDF Standard Security Handler (Rev 2). Compatible with Adobe Acrobat, Chrome PDF viewer, Edge, and all major PDF readers.

Can I set different passwords for opening and editing?

Yes. The "open password" is required to view the PDF. The "owner password" controls printing, copying and editing permissions separately.

What if I forget the password?

There is no recovery option. Store your password safely — we cannot retrieve it.

Does the tool upload my file or password?

Never. Everything happens locally in your browser. Your file and password are never transmitted anywhere.

Related tools

📄 Unlock PDF📄 Merge PDF📄 Sign PDF

Lock your PDF with a password to control who can open, copy, or print it. The entire encryption process happens in your browser — your password and file never leave your device.

How to use this tool

1

Upload your PDF

Select the PDF you want to password protect.

2

Set a strong password

Enter an open password. Optionally add an owner password to control permissions.

3

Download protected file

Click "Protect and Download" to get your encrypted PDF.

Common uses

Frequently asked questions

What is the difference between open and owner password?

The open password prevents viewing. The owner password controls editing, printing, and copying permissions without blocking access.

Can the password be recovered if forgotten?

No. Store your password safely in a password manager — there is no recovery option.

Is the encryption strong?

The tool uses RC4 encryption supported by Adobe Acrobat, Chrome, Edge, and all major mobile PDF viewers.

Does my password get sent anywhere?

Never. Everything runs in your browser. Nothing leaves your device.