AES encryption
Industry-standard encryption supported by all major readers.
Free Protect PDF
Password Protect a PDF
Encrypt your PDF so only people with the password can open it.
Open Protect PDF
Free · No watermark · Files are processed securely and never stored
What is Protect PDF?
Protecting a PDF with a password encrypts the file so it cannot be opened, read or printed without that password. SuperPrompts' free Protect PDF tool applies AES encryption, the same standard used by Adobe Acrobat, and sets an open password that every major PDF reader on Windows, Mac, iPhone and Android will ask for. It is a simple way to share contracts, bank statements, medical records or HR documents by email with less risk if the message is forwarded or the attachment leaks. Choose a strong password and share it through a different channel than the file, such as a text message. SuperPrompts does not store your password, so keep it safe.
How to use Protect PDF
- 1Upload your PDF.
- 2Enter a strong password.
- 3Click Protect PDF.
- 4Download the encrypted file.
Why use SuperPrompts Protect PDF?
Works everywhere
Adobe, Preview, Chrome, iPhone and Android all prompt for the password.
Nothing stored
Your password is not saved.
Frequently asked questions
How do I password protect a PDF?
Upload the PDF, enter a password, click Protect PDF and download the encrypted file.
Can I recover a forgotten password?
No. The password isn't stored, so keep it somewhere safe.
Which encryption is used?
AES encryption, the standard used by Adobe Acrobat.
Is it free?
Yes.
Related free tools
Unlock PDF
Remove a password you know, so you don't have to type it every time.
Redact PDF
Black out sensitive information so it can never be recovered.
Add Watermark
Stamp "CONFIDENTIAL", "DRAFT" or your logo across your pages.
Sign PDF
Draw your signature, place it on the page, resize it, and download the signed PDF.
Ready to protect pdf?
One of 30+ free PDF tools on SuperPrompts.
Open Protect PDF