Password Protect PDF Online
Add a strong password to any PDF — instantly.
AES-256 encryption keeps your documents private.
Protect a PDF →
🔒 Files processed securely · No account required to preview · Auto-deleted after processing
Free — Preview always free
$1.99 — Download once
$8.99/mo — Pro unlimited
Frequently Asked Questions
What encryption does PDFRealm use?
PDFRealm uses AES-256 encryption, the industry standard for PDF password protection.
Can I also set permissions (e.g. prevent printing)?
Yes. You can set a separate permissions password to restrict printing, copying, or editing in addition to the open password.
Is my file safe during processing?
Your file is uploaded over HTTPS and deleted from our servers after your session. The password is applied on our server and the encrypted file is returned to you.
Do I need an account?
No account required to preview. Download once for $1.99 or subscribe to Pro for unlimited protected PDFs.