Protect PDF

    Free Tool

    Encrypt your PDF locally with native PDF password protection and download a standard protected PDF.

    Privacy first: this tool runs fully client-side. If you do not trust us, turn off your internet, do your task, then close this browser — that ensures 100% offline processing.

    Protection summary

    Selected file:

    User password ready: No

    Owner password set: No

    Algorithm: AES-256

    • AES-256 is recommended for most files.

    • RC4 only for legacy compatibility.

    • Keep passwords safe — they are required to open later.

    Use the matching Unlock PDF tool to remove passwords from encrypted PDFs you can legally access.