mypdf.space

Short 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.

Stays on your device·No upload·No account·No watermark·Offline after install·How it worksMethodologyPrivacy

Password-protect a PDF online

Free · private · files stay on your device

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How it works

  1. 1

    Open an unlocked PDF.

  2. 2

    Set a password you will remember.

  3. 3

    Encrypt and download the protected file.

Files never leave your device

Your PDF is processed in this browser tab. Files never leave your device, and mypdf.space does not receive uploads. No account, no watermark, no server-side copy.

Limits worth knowing

  • 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.

Frequently asked questions

  • 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.

Written by Sumit · Last updated 23 Oct 2026