Protect PDF — Add Password to Lock PDFs Online

Drag and drop your PDF here

or click to browse from local storage

filename.pdf
1.2 MB 4 Pages
Encryption & Security Options
Required to open and view the PDF. Make sure to remember this password!

Protect PDF — Add Password to PDF

Secure your sensitive PDF documents, invoices, or personal statements by encrypting them with a password. This tool uses industry-standard encryption algorithms to lock your files, preventing unauthorized opening or modifications. The encryption is performed locally in your browser, so your passwords never cross the internet.

How to Use the Protect PDF Tool:

  • Use the drag-and-drop zone or click to upload your files locally.
  • Configure settings (such as formats, parameters, or compression options) if available.
  • Click the primary action button to process your files or inputs in real-time.
  • Download the finalized output directly to your device without wait times.

Related Utilities:

Unlock PDFWatermark PDF

Frequently Asked Questions

What type of password encryption is used?

We use browser-safe cryptographic encryption standards to secure your PDF pages.

Can anyone decrypt my file without the password?

No, without the correct password, the PDF remains completely locked and unreadable.

Where is the password stored?

Nowhere. Passwords are used strictly during local encryption and are never saved or sent to any server.