Password Protect PDF — free, private, in your browser

Encrypt a PDF with a real password using native 128-bit PDF encryption. Unlike iLovePDF or Smallpdf, nothing is uploaded: the processing happens on your own device, so the tool works even with the Wi-Fi off.

Password Protect PDF now — no sign-up →

How it works

  1. 1Drop a PDF onto the page
  2. 2Set the open password and optional permissions
  3. 3Press Protect — readers will ask for the password on open

Questions

Are my files uploaded?

No. CommandEditor runs entirely in your browser with WebAssembly — your file never leaves your device. You can verify it: open your browser's network inspector, or switch off Wi-Fi after the page loads; the tool still works.

Is this real encryption?

Yes — the PDF Standard Security Handler (RC4 128-bit), the same scheme Acrobat uses. The file is genuinely encrypted, not just flagged. You can restrict printing, copying and editing too.

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CommandEditor is open source and free forever. 114 tools, 60+ voice commands, on-device AI — your files never leave your device.