How to Password Protect a PDF Online for Free

Try it now: PDF Password Protect →

A PDF containing sensitive information — a contract, a financial statement, personal records — is only as protected as the channel you send it through. Adding a password means the file itself requires that password to open, regardless of where it ends up.

When to password protect a PDF

• Sending a contract, invoice, or financial document that shouldn't be openable by just anyone
• Sharing personal records over email or a file-sharing link
• Adding a layer of protection to a document stored on a shared drive
• Restricting access to a document meant for a specific recipient only

How to password protect a PDF, step by step

1. Open PDF Password Protect.
2. Upload the PDF you want to secure.
3. Set a password for the file.
4. Download the password-protected PDF.

Tips for protecting a PDF properly

• Use a strong, unique password — see the Password Generator if you need one.
• Share the password through a different channel than the PDF itself — sending both together in the same email defeats the purpose.
• Keep a copy of the password somewhere safe. A password-protected PDF can't be opened without it, and there's no recovery option built into the file.

Common questions

What happens if I forget the password? The PDF can't be opened without it — there's no built-in way to recover a forgotten password from a protected PDF.

Does this stop someone from editing the PDF, or just opening it? This adds a password required to open the file. For restricting editing specifically, check whether your workflow needs additional permission controls beyond an open-password.

Can I remove the password later? Yes — use the PDF Unlock tool with the correct password to remove protection from a file you have legitimate access to.

Have a sensitive PDF to lock down? Password protect your PDF for free →