Protect PDF
Add a password and 256-bit encryption to a PDF. Free and fast, right in your browser — no signup, no installation.
How to protect pdf
- Add your PDF. Click the box to choose a file (or drag it in). Your file is uploaded over a secure connection and deleted automatically afterwards.
- Set your options. Adjust the settings to fit exactly what you need.
- Run Protect PDF. Press the Protect PDF button — your PDF is processed in seconds.
- Download. Your finished file downloads automatically. That's it.
Frequently asked questions
Is this free?
The core PDF tools on PDFGrove are free; this one is part of Pro, which also raises file-size limits and removes daily caps.
Are my files kept private?
Yes. Files are sent over an encrypted (HTTPS) connection and deleted from the server automatically a short time after processing.
Do I need to install anything?
No. PDFGrove runs entirely in your web browser — there's nothing to download or install.
Does it work on mobile?
Yes. It works in any modern browser on phones, tablets, and computers.
What file size can I use?
Free users can process files up to 10 MB; Pro raises the limit to 200 MB.