Protect — SecPDF
Protect a PDF with a password
A real lock, not a promise: your password encrypts the file itself — no password, no access, for anyone.
100% in your browserNo file uploadsFree, no signup
Drop your file here
or
Choose fileUp to 50 MB per file — processed locally, never uploaded
How it works
Open your PDF
Drop the document into the box — it stays on your device the whole time.
Set a password
Choose a strong password and decide what readers may do: print, copy or modify.
Encrypt & download
Click Encrypt PDF and download the protected file. Every PDF viewer will ask for the password.
Frequently asked questions
Here, yes — because nothing is online about the processing. Encryption runs locally in your browser; your file and password are never sent to any server.