PDFSlick

Protect PDF

Add a password to your PDF to prevent unauthorized access.

How it works

  1. 1

    Upload your PDF

    Drop a PDF onto the upload area.

  2. 2

    Set a password

    Enter the password recipients will need to open the PDF. Optionally set a separate owner password.

  3. 3

    Download

    Your protected PDF downloads automatically. The file is deleted from our server right after.

Processed securely, deleted within 1 hour

Files are transferred over HTTPS, assigned a random ID, processed on our servers, and automatically deleted within 60 minutes. We never log file contents.

Frequently asked questions

What encryption is used?

128-bit RC4/AES encryption via Ghostscript — the standard for PDF security, compatible with all PDF readers.

Is my file safe?

Files are uploaded over HTTPS and deleted from the server immediately after your download. We never store or access file contents.

Can I remove the password later?

Yes. Use the Unlock PDF tool — enter the password and download a copy without password protection.