Protect PDF with Password
Add a password to a PDF so only people with the password can open it. Server-side 256-bit encryption — free and secure.
What is Protect PDF with Password?
Protecting a PDF adds password encryption so that anyone opening the file must enter the password you set. NewKitApp applies 256-bit AES encryption server-side — the same standard banks and governments rely on — which scrambles the PDF's contents so it can't be read without the password. This is the right way to secure a contract, financial statement, or any sensitive document before emailing or storing it. The password itself is never stored: it's used only for the moment of encryption, then discarded along with your file after processing. Browser-only tools can't reliably encrypt a PDF; doing it server-side guarantees strong, standards-compliant protection.
How to Use Protect PDF with Password
- Drag your PDF onto the dropzone, or click to choose a file.
- Enter a strong password, then type it again to confirm. Use a password you'll remember — there's no recovery if you lose it.
- Click Protect PDF. The file is encrypted and ready in seconds.
- Download the protected PDF. You'll need the password to open it from now on.
Examples
Secure contract
Input: Signed employment contract PDF
Output: Password-protected PDF only the recipient can open
Private statement
Input: Bank statement PDF
Output: Encrypted PDF safe to email
Common Mistakes
- Using a weak password — with encryption, the password IS the security; use a long, random one.
- Forgetting the password — there's no recovery, and we can't help you decrypt it.
- Confusing protection (encryption) with sanitizing (stripping code) — they solve different problems.
Why Use This Tool
- 256-bit AES encryption is the gold standard for PDF security.
- The password is never stored — used only for encryption, then discarded.
- Your content stays identical once the file is unlocked.
- Free and private — files are deleted right after processing.