Are my files uploaded to a server?

No. Every file you select is processed entirely inside your browser using your device's own memory. Nothing is uploaded, stored or shared, so customer documents never leave your computer or phone.

Is there any limit, watermark or sign-up?

No. The tool is free, unlimited and needs no account. Output files carry no watermark of any kind.

Is the password really required to open the file?

Yes. The PDF is genuinely encrypted, so any standard PDF reader will ask for the password before showing the document.

What if I forget the password?

The file cannot be opened again. Nothing is stored here, so the password cannot be recovered — always keep the original PDF safe.

PDF Security

Protect PDF

Lock a PDF with a password before you share it.

Runs fully in your browser Free, unlimited, no watermark

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How to use

1Select the PDF you want to protect.
2Type a password and confirm it.
3Press Protect PDF and download the locked file.

About this tool

Add a real password to a PDF so it cannot be opened without it. Encryption is applied inside your browser, which makes it a practical way to protect customer paperwork sent by email or WhatsApp.