# Password-protect a PDF online

> Password-protect a PDF online for free. AES encryption in your browser — we never see the file or password. No watermark.

Canonical: https://mypdf.space/password-protect-pdf
Last updated: 2026-10-26

## Answer

Drop an unlocked PDF into the tool below, set a password, and download the encrypted file. Send the password on a different channel from the file itself.

## Limits

- Already-encrypted PDFs must be unlocked before you can set a new password.
- Permission flags (no copy/print) are requests some viewers ignore — the open password is the real protection.
- There is no password recovery if you forget it.

## FAQ

### How do I password-protect a PDF for free?

Open Encrypt PDF here, choose a password, encrypt, and download. Processing stays on your device.

### Do you see my password?

No. Encryption runs locally. The password never leaves your device.

### Should I email the password with the file?

No. Send the password by call, SMS, or another chat — not in the same email as the PDF.

## Related

- [Password-protect a PDF online](https://mypdf.space/tools/encrypt-pdf)
- [Unlock PDF](https://mypdf.space/unlock-pdf)
- [Password-protect guide](https://mypdf.space/guides/password-protect-pdf)
- [Share a PDF securely](https://mypdf.space/guides/share-pdf-securely)
- [Check for hidden data](https://mypdf.space/check-pdf-for-hidden-data)