What encryption is used?

We use RC4 128-bit encryption, which is widely supported by all PDF readers.

What's the difference between user and owner passwords?

The user password is required to open the PDF. The owner password controls editing and printing permissions.

Password protect after splitting, signing, or watermarking — finish your workflow

100% private — your files never leave your browser. All processing happens locally on your device, nothing is uploaded to any server.

Client-Side OnlySecure

Select or drag & drop the PDF file to protect.

Enter a password to restrict opening the PDF. Optionally set an owner password.

Download your encrypted PDF — or go back and split, sign, or watermark before locking it down.

100% Private

Files never leave your browser

No server processing

No file size limits

Extract pages, then continue with merge, sign, or encrypt — no re-upload

Combine multiple PDFs, then compress, sign, or encrypt — all in one flow

Rotate pages, then continue with split, sign, or compress — no re-upload