Protect PDF
Add a password so only people you trust can open your PDF. Everything happens on your device.
100% private. Your files are processed entirely in your browser and never uploaded.
This password will be needed to open the file. It is never sent anywhere - keep it safe, it cannot be recovered.
- Add the PDF you want to lock.
- Type the password readers will need to open it.
- Select Protect PDF and your encrypted file downloads.
FAQs about Protect PDF
Does my file leave my device?
No. The password is applied right inside your browser using a local security engine. Your PDF is never uploaded.
What encryption is used?
AES 256-bit, the same standard used by most professional PDF tools. The reader will ask for your password before opening the file.
Why does the first run take a moment?
The page loads a small security engine (about 1-3 MB) the first time you protect or unlock a file. After that it is cached and instant.
I forgot the password I set. Can you recover it?
No. The password is never stored anywhere, so keep it safe. Without it the file cannot be opened.