Protect PDF with Password
Add a password to your PDF online free. AES-256 encryption keeps your documents secure. No signup required.
How it works
- 1
Upload your PDF
Upload the PDF you want to protect.
- 2
Set a password
Enter the password you want to use to lock the PDF.
- 3
Encrypt PDF
Click Protect. The PDF is encrypted with AES-256.
- 4
Download
Download the protected PDF. Files are deleted after 2 hours.
Frequently asked questions
What encryption is used?
AES-256 encryption, the industry standard for document security.
Can I recover the password if I forget it?
No. The password cannot be recovered. Keep it in a safe place.
Can I open the protected PDF on any device?
Yes. Any PDF reader (Adobe Acrobat, Preview, Chrome) will prompt for the password when opening.
Is there a file size limit?
File size limits depend on your plan: Freemium 5 MB, Starter 100 MB, Pro 250 MB, Business 500 MB.