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Protect PDF

Add a password to your PDF so only authorized users can open it. Your file stays in your browser — nothing is uploaded.

ℹ️ Browser limitation: True PDF encryption requires a server-side PDF library. This tool embeds your password as metadata and adds a protective marker, but for strong AES-256 encryption we recommend Adobe Acrobat or a desktop PDF editor.

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Drop your PDF here

or click to browse

How to protect pdf online

Select your file

Click the upload area or drag and drop your file — nothing is sent to a server.

Adjust the options

Fine-tune any settings for Protect PDF, right in your browser.

Download the result

Your file is processed instantly and ready to download in seconds.

Frequently asked questions

Is the Protect PDF tool free to use?

Yes, Protect PDF is completely free on PDFPace, with no limits and no account required.

Is it safe to use Protect PDF on PDFPace?

Yes. Protect PDF runs entirely in your browser — your files are never uploaded to a server, so your documents stay private.

Do I need to install any software?

No installation is required. Protect PDF works directly in your web browser on desktop, tablet or mobile.

Can I use Protect PDF on mobile?

Yes, Protect PDF works on any device with a modern browser, including phones and tablets.