Before sending a sensitive document, Protect PDF adds a password requirement to open it. Anyone without the password can't view the file at all — share the password separately from the document itself.
How to protect pdf
- 1
Upload your PDF file
Drag it onto the upload area, or click to choose it from your device.
- 2
Select Protect PDF
Choose the tool, then set the password.
- 3
Click Protect
Your file is processed on our server, which applies real password-based encryption.
- 4
Download your protected PDF
Share the password separately from the file so only the right people can open it.
Why use RealPDFTool for protect pdf
Real encryption, not just a viewer prompt
The password is enforced by the PDF format itself, not just a wrapper around the file.
Frequently asked questions about protect pdf
What happens if I forget the password?
There's no way to recover a lost password — the encryption is real, so keep a copy of the password somewhere safe.
Can I remove the password later?
Yes, use Unlock PDF with the password to remove it again.
Is there a file size limit?
PDFs up to 100MB are supported, since protection runs on our server.
Are my files stored on your servers?
Files are processed to apply the password and then deleted — they aren't kept or reused.