What encryption is used?

AES-128 by default for wide compatibility, or AES-256 for stronger protection. You can also set an optional owner password and printing/copying/modifying permissions. Everything runs in your browser via @cantoo/pdf-lib—passwords never leave your device.

Can I recover a lost password?

No. Keep a safe copy of the unprotected original.

Files processed locally in your browser.

Encrypt PDF

Password-protect a PDF and set print/copy permissions.

1Upload
2Configure
3Process
4Download

Legal notice

Only encrypt or unlock PDFs you own or have explicit rights to modify. This site does not crack unknown passwords. Unauthorized circumvention of access controls may be illegal.

Drop a PDF to encrypt

or click to browse · files over 20 MB may be slow on phones

People also use

Related workflows

How to Password-Protect a PDF in Your Browser
Encrypt a PDF with a password and optional print/copy restrictions—privately.
Why In-Browser PDF Tools Are More Private Than Upload Sites
When you upload a PDF to a remote converter, you trust that server with whatever is inside. Local processing changes the risk model.

What this tool does

Encrypt PDF applies a user password so recipients need credentials to open the file. Always store passwords securely and share them out-of-band. Keep an unprotected backup of files you own.

How to use it

Upload a PDF you own or are authorized to protect.
Set a user password, optional owner password, AES-128 or AES-256, and print/copy/modify permissions.
Protect and download the encrypted file.

Common use cases

Protect tax PDFs before emailing
Share sensitive decks with a password
Add a basic barrier before wider distribution

FAQs

What encryption is used?: AES-128 by default for wide compatibility, or AES-256 for stronger protection. You can also set an optional owner password and printing/copying/modifying permissions. Everything runs in your browser via @cantoo/pdf-lib—passwords never leave your device.
Can I recover a lost password?: No. Keep a safe copy of the unprotected original.
Legal notice: Only encrypt or unlock PDFs you own or have explicit rights to modify. This site does not crack unknown passwords. Unauthorized circumvention of access controls may be illegal.