What is the difference between a user and owner password?

The user password (also called the open password) is required to open and view the PDF. The owner password restricts operations like editing, printing, and copying — it does not prevent viewing.

How strong is the encryption?

The tool applies RC4 or AES encryption as supported by the pdf-lib library used client-side. For highly sensitive documents, use dedicated security software for stronger AES-256 encryption.

Can I remove the password later?

Yes. You can use a PDF unlock tool and provide the correct password to remove restrictions from the file.

What happens if I forget the password?

There is no recovery option. If you lose the password to a protected PDF, the content is inaccessible. Store passwords securely.

Are my files kept private?

Yes. All encryption happens locally in your browser. Your PDF and passwords are never sent to any server.

Password Protect PDF — Encrypt PDF with Password Online Free | Toolivon

Password Protect PDF — Encrypt & Lock PDF

Set a user password to restrict opening, and an owner password to restrict editing.

Your files never leave your browser. All processing happens locally.

Note:pdf-lib's client-side encryption uses RC4-128. For AES-256 encryption (stronger security), use a server-side tool or your PDF viewer's built-in security dialog (File → Properties → Security in Adobe Acrobat).

Drop a PDF to protect

or click to browse — max 100 MB

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How to Password Protect a PDF

1
Upload your PDF
Drop the PDF you want to protect onto the upload zone or click to browse.
2
Enter a user password
Set a user password that recipients must enter to open and view the PDF.
3
Optionally enter an owner password
Set an owner password to restrict editing, printing, and copying. Leave blank to skip this restriction.
4
Click Protect PDF
The PDF is encrypted in your browser using the passwords you provided.
5
Download the protected PDF
The password-protected PDF downloads automatically. Share it securely.

Frequently Asked Questions

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How to Password Protect a PDF

Upload your PDF

Drop the PDF you want to protect onto the upload zone or click to browse.

Enter a user password

Set a user password that recipients must enter to open and view the PDF.

Optionally enter an owner password

Set an owner password to restrict editing, printing, and copying. Leave blank to skip this restriction.