PDF
Protect PDF
Lock a PDF with a password (AES-256 encryption). It’s free, works in your browser, and your files are never uploaded.
How to use Protect PDF
- Add your file by dragging it in or choosing it.
- Choose your options.
- Click “Apply” and download the result.
Why use Protect PDF on Free File Converter Fox
- Private. Files are processed on your device and never uploaded.
- Free. No account, watermark or daily limit.
- Fast. No upload or download wait, since everything runs locally.
Frequently asked questions
Is Protect PDF free?
Yes. Protect PDF on Free File Converter Fox is free, with no sign-up, watermark or daily limit.
Is my file uploaded to a server?
No. Protect PDF runs entirely in your browser, so your files stay on your device and are never sent to us.
Is the password stored anywhere?
No. Encryption happens on your device. If you forget the password, we cannot recover it.
What should I do if Protect PDF fails?
Try a smaller file, reload the page, or use a current version of Chrome, Edge, Firefox or Safari. Very large files can run out of memory, especially on phones.