PDF Protect

Secure your PDF files with passwords and 128-bit encryption. 100% client-side processing for maximum privacy.

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Drop a PDF file here or click to upload

Select a single PDF file to encrypt and password-protect

How to Protect a PDF

  1. Upload a PDF by dragging and dropping it, or clicking the upload area.
  2. Enter a User Password. This is the password anyone will need to type to open and view the document.
  3. (Optional) Enter an Owner Password to manage permissions.
  4. Click Encrypt PDF to secure the file. Your new protected PDF will download automatically.

Frequently Asked Questions

Is the encryption secure?

Yes, this tool uses standard 128-bit RC4 encryption (Algorithm 2 & 3 from the PDF specification), which is fully supported by all modern PDF viewers including Chrome, Acrobat, and Mac Preview.

Does my file get uploaded to a server?

No! Just like our other tools, the encryption happens entirely locally in your web browser. Your document is never uploaded anywhere, ensuring complete privacy.

Can I protect a document that's already encrypted?

Currently, you must first decrypt/unlock a document using your existing PDF software before you can apply a new password using this tool.

ESC