Password Protect a PDF — Free & Private
Encrypt a PDF with a password using strong AES-256 encryption, right in your browser. Your confidential file is never uploaded. No accounts, no watermarks, no limits.
🔒 Protect a PDF now →How to password protect a PDF for free
- Open the Moriaki PDF protect tool in your browser.
- Drag and drop the PDF you want to secure.
- Enter the password you want to require to open the file.
- Click Protect and download the encrypted PDF. Your file never leaves your device.
Why password protect PDFs with Moriaki?
Encrypting a sensitive document on a website that first uploads it to a server defeats the purpose. Moriaki applies AES-256 encryption locally in your browser, so the unprotected file and your password never leave your device.
The result is a properly encrypted PDF that asks for your password to open — with no watermark, no account, and no file size games.
Frequently asked questions
Is password protecting a PDF free?
Yes — free, with no account, no limits, and no watermark.
Is my file or password uploaded?
No. Encryption runs entirely in your browser; neither the file nor the password is ever sent to a server.
How strong is the encryption?
It uses AES-256, the same strong standard used to secure sensitive documents.
What happens if I forget the password?
The PDF cannot be opened without it, and we cannot recover it — there is no copy anywhere. Store your password safely.
Does it work on mobile?
Yes — in any modern browser, with no app needed.