Protect PDF

Set a password so others need it to open your PDF. Encryption runs locally in your browser.

lock

Drop a PDF here or click to browse

Max 100 MB · AES encryption via @cantoo/pdf-lib

Other PDF Tools

How to password-protect a PDF

Encrypt your PDF with a user password so recipients must enter it to open the file. Encryption runs in your browser with @cantoo/pdf-lib.

Use this page as a full workflow guide: follow the steps below, then read the tips and FAQs before you start so you know what stays private, what limits apply, and how to get a reliable result on the first try.

How it works

  1. 1Upload the PDF you want to protect.
  2. 2Choose a strong user password and confirm it.
  3. 3Optionally set an owner password and print permission.
  4. 4Download the encrypted PDF and store the password safely.

Tips for better results

  • Keep a copy of your original file — exports and compressions can permanently reduce quality or change layout.
  • Prefer a modern desktop browser for large files; phones work for smaller jobs but can run out of memory.
  • If a step fails, reload the page and try a smaller file or a simpler setting before retrying.

Frequently asked questions

Can ToolJee recover my password?

No. Passwords never leave your device. If you forget it, you cannot reopen the protected file through us.

User vs owner password?

User password opens the file (with limited permissions). Owner password is for full access control.

Is this the same as Unlock PDF?

Protect adds a password. Unlock removes one when you already know it.

Will every PDF reader support it?

Modern readers support standard PDF encryption. Very old software may struggle.

Is my file uploaded to ToolJee for this tool?

Conversion and editing for PDF, image, video, and QR tools run in your browser. Optional File Share and Business cloud save only store what you explicitly choose to save or share.

Do I need an account?

Most tools work without signing in. File Share uploads and Business cloud save require an account.

Why add how-to text on a tool page?

So you can complete the job with clear expectations — privacy, limits, and common mistakes — even before you click the first button.