Secure PDF
Protect a PDF with a password
Apply verified AES-256 password protection without uploading the document.
Choose a file
Choose one unlocked PDF up to 120 MB.
How it works
- 1
Choose an unlocked PDF and enter a strong password twice.
- 2
Rebuild applies AES-256 encryption locally in this browser.
- 3
The result is unlocked internally with your password and page-checked before download.
Questions
Which encryption is used?
Rebuild applies AES-256 PDF password protection.
Does Rebuild store my password?
No. The password stays in this page while processing and is cleared when the result is ready.
What if I forget the password?
Rebuild cannot recover it. Keep the original PDF and store the password safely.