Protect PDF Online Free
Password protect a PDF with AES-256 encryption in your browser. Confirm the password and download a protected copy without uploading your file.
Processed in your browser
Your PDF
Choose a PDF to protect
One unlocked PDF up to 50 MB
How to use Protect PDF
Three steps. No account or upload server.
- 01
Select an unlocked PDF
Choose or drop one PDF up to 50 MB.
- 02
Set an open password
Enter at least eight characters, then confirm the password. Choose a password you can securely keep or share.
- 03
Download the protected copy
Encrypt the PDF and download it. Reopen it in a PDF reader and enter the password.
Share a confidential PDF with a password
Set a unique password, download the protected copy and reopen it to check that your reader prompts for it. Share the password with your recipient separately from the PDF.
Protect PDF questions
Short answers, then the practical details.
Does the new PDF require a password to open?
Yes. Zipora uses AES-256 PDF encryption and requires the password to open the downloaded copy. Anyone who knows the password can open it.
What if I forget the password?
Zipora does not store or recover passwords. Keep the password and the original file somewhere safe. The encrypted copy cannot be opened without a valid password.
Can I protect an already locked PDF?
This tool takes an unlocked PDF. If you have permission to change an already protected document, first save an unlocked copy using a reader that supports that operation. Editing a signed document can invalidate the signature.