Protect PDF

Lock a PDF with a password and encryption to restrict who can open it. Processed on an isolated server, with no file retention.

The Protect PDF tool applies AES-256 encryption and a password to your document, with secure processing on an isolated server.

You choose a strong password and confirm it. The tool applies AES-256 encryption via qpdf, ensuring the document can only be opened by whoever has the password.

This tool sends data to a server and needs a connection during processing. The worker attempts to remove temporary files after the task. Immediate deletion is not guaranteed if a failure occurs.

Keep your password safe: it cannot be recovered. Without the password, access to the protected document is impossible.

When to use it

Protecting a contract with sensitive data before emailing it.
Encrypting a personal document stored in the cloud.

Limitations

Forgotten passwords cannot be recovered; store them in a password manager.
Password protection controls access but does not stop an authorized person from copying the content.

Step by step

Select the PDF.
Choose and confirm a strong password.
Click Protect PDF and download the encrypted version.

Frequently asked questions

Which encryption is applied?

AES-256, a robust encryption standard applied via qpdf on the isolated server.

Is my password stored?

No. The password is never logged and does not persist after processing.

Can I recover a forgotten password?

No. Without the password, access to the protected document is impossible.