What is the difference between a User Password and an Owner Password in PDFs?

The user password opens the document with the selected permissions. A separate owner password grants full access. If you leave the owner field blank, the tool generates a random owner password; the user password can still decrypt the file here. Viewer enforcement of print, copy and editing permissions varies.

What encryption standards are used for password protection?

New protected PDFs use standard AES-256 (revision 6) encryption. Use a modern PDF reader that supports this format. The tool does not offer insecure RC4 or AES-128 encryption modes.

Can I remove a password from a protected PDF if I know the password?

Yes. Select the "Remove Password" tab, enter the valid document password, and the tool will generate an unencrypted, open version of the PDF.

Are my passwords and documents safe?

Yes. All cryptographic operations run 100% in local browser JavaScript. Your password and document data never leave your computer.

PDF Converters

PDF Password Protector & Remover

Protect PDFs with AES-256 or unlock them with a valid password, entirely in your browser. Upload limit: 50 MB.

🔒 Zero-Knowledge PDF Security: All password encryption and restriction removal run entirely in your local browser memory. Passwords and documents are never transmitted over the internet.

PDF Target Document

No PDF uploaded

Mode: AES-256 Password Encryption

Security Action Status

Configure Password & Permissions Below

Password Strength: Empty (0%)

Set Document Passwords

User Open Password *

Confirm Password *

Owner / Permissions Password (optional)

Use a different password for full permissions. If left blank, a random owner password is generated. Your open password can still unlock the PDF here. Viewer support for print, copy and editing restrictions varies.

Document Permissions

Allow PrintingAllow Copying TextAllow Editing

100% Private. Your data never leaves your device.

FreeToolsBox • Instant & Free

What is PDF Password Protector & Remover?

The PDF Password Protector encrypts PDF documents with AES-256 in your browser. Set an open password and optional separate owner password, choose print, copy and editing permissions, then download the protected PDF. Unlock mode accepts a valid user or owner password and produces an unencrypted copy. Files up to 50 MB are processed locally.

Designed for accuracy, speed, and privacy, this tool runs entirely on your local device with zero network latency.

How to Use the PDF Password Protector & Remover

1
Upload the PDF file you want to protect or decrypt.
2
Select "Protect PDF (Add Password)" or "Unlock PDF (Remove Password)".
3
To protect, enter and confirm the open password, optionally set a different owner password, and choose permissions. To unlock, enter the current document password.
4
Click "Encrypt & Protect PDF Now" or "Unlock & Remove Restrictions", then use the download button after success.

Formula & Calculation Logic

QPDF compiled to WebAssembly applies standard PDF AES-256 encryption in a local browser worker. The downloaded file remains a PDF and requires the user or owner password to open. Permission enforcement depends on the PDF viewer.

PDF Standard Security Handler: AES-256, revision 6; user/owner passwords and PDF permission flags

PDF Password Protector & Remover Frequently Asked Questions

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