TToolNest
All Tools / PDF / Protect PDF

Protect PDF

Add AES-256 password encryption to a PDF directly in your browser.

🔒 Keep your password somewhere safe. We cannot recover it if you lose it.
✓ Your PDF and password are processed locally in your browser and are not uploaded to our server.

How it works

  1. Select a PDF.
  2. Enter and confirm a password.
  3. Click Protect & download PDF.
About this tool

What is Protect PDF?

Protect PDF adds password protection to a PDF so that a password is required to open the protected output. It is useful when you need an extra access-control layer before sharing a document.

How to use it

Three simple steps

  1. Choose the PDF you want to protect.
  2. Enter and confirm a strong password.
  3. Protect the document and download the encrypted PDF.
Why use it

Built for quick everyday tasks

  • Adds password-based PDF encryption.
  • Password processing is intended to remain in the browser.
  • Creates a separate protected copy.
Related tools

You may also need

PDF
Merge PDF

Combine multiple PDF files into a single document.

→⇄
Split PDF

Extract selected pages from a PDF into a new document.

→IMG
JPG to PDF

Turn JPG and PNG images into one PDF file.

→PNG
PNG to PDF

Combine one or more PNG images into a PDF file.

→
FAQ

Frequently asked questions

What happens if I forget the password?

ToolNest cannot recover a password you lose. Store it securely before sharing the file.

Should I use a strong password?

Yes. A longer, unique password is generally safer than a short or reused password.

Does ToolNest store my password?

The tool is designed to process the password locally in your browser rather than sending it to our server.