Free PDF tool

Password Protect a PDF Online

Encrypt a PDF with a password before sharing it. The tool uses AES-256 protection and runs in your browser.

Use Protect PDF free →No signup required · Everyday files are processed in your browser

Simple and focused

Protect PDF without installing software

Add a password to sensitive reports, statements, forms, and attachments. Keep the password somewhere safe because recipients will need it to open the file.

How it works

Finish in three steps

Choose one PDF file.

Enter and securely record a new password.

Protect the PDF and download the encrypted copy.

Built for everyday PDFs

What this tool gives you

✓AES-256 PDF encryption
✓Creates a separately protected copy
✓No account needed

Questions

Protect PDF FAQ

What encryption does the tool use?

The Protect PDF tool uses AES-256 encryption.

Can FreePDFchanger recover a forgotten password?

No. Store the password safely; it is required to open the protected document.

Ready to work on your PDF?

Open Protect PDF, choose your file, and download the result.

Open Protect PDF →