All tools
Protect PDF
Encrypt with AES-256 and a password, and limit printing or copying.
Choose a fileLoading the tool…
Keep sensitive documents safe. Set an open password, choose what readers are allowed to do, and download an AES-256 encrypted PDF.
How to password-protect a PDF
- Choose your PDF.
- Enter a password twice and set permissions.
- Click “Protect PDF” and download.
Frequently asked questions
What if I forget the password?
There is no way to recover it, so store it somewhere safe before sharing the file.
How strong is the encryption?
Files are encrypted with AES-256, the strongest standard PDF encryption.
Are my files uploaded to a server?
No. ModifyPDF processes files with JavaScript inside your browser. Your documents never leave your device, and nothing is stored after you close the page.