PDF Lock Local processing
Private by design

Password-protect a PDF without uploading it.

Your file is encrypted directly in this browser using AES-256. The PDF and the password you enter are never sent to a server.

Your document stays on this device

There is no upload step, no account, no document storage and no analytics. Encryption happens in browser memory.

1

Choose a PDF

Select one PDF from your device.

2

Set an opening password

This password will be required whenever the protected PDF is opened.

Password strength Not set

AES-256 encryption Standard PDF password protection for modern PDF readers.

Processed locally

The file stays in browser memory while it is being encrypted.

No document upload

The app contains no endpoint that receives your PDF or password.

Ready to share

The downloaded PDF prompts for your password in compatible readers.