Protect PDF

Add a password to a PDF so only people with the password can open it. Standard AES-128 encryption.

Private - runs in your browser No signup required Free forever

Drop a PDF or click

Password

Confirm

Note: pdf-lib supports password setting only with the qpdf-style fallback. If your browser cannot encrypt, the file will download unprotected and we will warn you. For maximum compatibility, use a desktop tool like qpdf or LibreOffice.

How to use Protect PDF

Upload a PDF.
Enter a password.
Click Protect & Download.

Features

AES-128 encryption
Open-password protection
Browser-side

Why use it

Keep documents private
No cloud upload

Frequently asked questions

What if I forget the password?

There is no recovery - please save the password somewhere safe.

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