Protect PDF with Password
Lock your PDF with a password — encrypted with AES-256 in your browser. Nothing is uploaded anywhere.
How to use it
- Click Choose PDF (or drag and drop your file onto the button).
- Type a password twice and click Protect PDF.
- Download the locked file — it will ask for the password every time it is opened.
Real encryption, not a trick
This tool applies the standard PDF password protection (AES-256, the same strength banks use) to every page, image and text block inside your file. The password prompt you see in Adobe Reader or Chrome afterwards is enforced by the PDF format itself — not by our website. Everything happens on your device: your document and your password are never sent to any server.
One honest warning
There is no password recovery. If you forget the password, nobody — not even us — can open the file. Write it down somewhere safe before you close this tab.
Frequently asked questions
How do I put a password on a PDF?
Choose your PDF, type a password (twice, to confirm), and click Protect PDF. The encrypted file downloads — it asks for the password every time anyone opens it.
Is my PDF uploaded to a server?
No. The password protection is applied in your browser with AES-256 encryption; your document and your password never leave your device.
What if I forget the password?
There is no recovery — that is the point of encryption. Write the password down somewhere safe before you close the tab.
Will the password work in any PDF reader?
Yes. It uses the standard PDF password protection (AES-256), so Adobe Reader, Chrome, Edge, and phone PDF apps all ask for the password on open.