Security

Protect PDF

Add a password with strong AES-256 encryption.

Runs on your device. Your file is never uploaded.

Choose a file or drop it here

Your file stays on this device.

How to protect pdf

Add a PDF.
Choose a password and what people may do (print, copy, edit).
Download the encrypted PDF.

Questions

Is my file uploaded?

No. This tool runs inside your browser with code loaded from signofficially.com. Your file is read, changed and saved on your own device. Open your browser's developer tools, choose the Network tab and use the tool: no file leaves your computer.

Can you recover my password?

No. The password never leaves your device, so we cannot recover it. Keep it somewhere safe.

Is it free?

Yes. Every on-device tool is free to use, with no limits. Paid plans add unlimited signature requests, teams and more.

More tools

Unlock PDFRemove a password you know from a PDF. Redact PDFBlack out text and images so they are gone for good. Compare PDFSee what changed between two versions, page by page. Merge PDFCombine several PDFs into one, in the order you choose.