Which encryption is used?

AES-256, the modern PDF password standard.

Can I unlock it later?

Yes — use Unlock PDF with the same password.

Yes. Password-protect PDFs online free on korisa.app.

Password-protect a PDF online with AES-256 encryption. Free, private Protect PDF tool in your browser.

PDF

Runs entirely in your browser — files stay on your device.

Add AES-256 password protection in your browser

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Encrypt without uploading

Required to open the protected file

Password

Confirm

Allow printingAllow copying text

Add a password so others need credentials to open your PDF. Choose whether printing or copying is allowed.

Encryption runs in the browser with AES-256 — nothing is uploaded.